Use an _ex() accessor for detecting errors reading stats.

[libpcap] / configure.ac

dnl
dnl Copyright (c) 1994, 1995, 1996, 1997
dnl     The Regents of the University of California.  All rights reserved.
dnl
dnl Process this file with autoconf to produce a configure script.
dnl

#
# See
#
#       http://ftp.gnu.org/gnu/config/README
#
# for the URLs to use to fetch new versions of config.guess and
# config.sub.
#

AC_PREREQ(2.64)

AC_INIT(pcap, m4_esyscmd_s([cat VERSION]))
AC_CONFIG_SRCDIR(pcap.c)
AC_SUBST(PACKAGE_NAME)

AC_CANONICAL_SYSTEM

AC_LBL_C_INIT_BEFORE_CC(V_CCOPT, V_INCLS)
#
# Try to enable as many C99 features as we can.
# At minimum, we want C++/C99-style // comments.
#
AC_PROG_CC_C99
AC_LBL_C_INIT(V_CCOPT, V_INCLS)
AC_LBL_SHLIBS_INIT
AC_LBL_C_INLINE

#
# Try to arrange for large file support.
#
AC_SYS_LARGEFILE
AC_FUNC_FSEEKO

dnl
dnl Even if <net/bpf.h> were, on all OSes that support BPF, fixed to
dnl include <sys/ioccom.h>, and we were to drop support for older
dnl releases without that fix, so that pcap-bpf.c doesn't need to
dnl include <sys/ioccom.h>, the test program in "AC_LBL_FIXINCLUDES"
dnl in "aclocal.m4" uses it, so we would still have to test for it
dnl and set "HAVE_SYS_IOCCOM_H" if we have it, otherwise
dnl "AC_LBL_FIXINCLUDES" wouldn't work on some platforms such as Solaris.
dnl
AC_CHECK_HEADERS(sys/ioccom.h sys/sockio.h limits.h)
AC_CHECK_HEADERS(netpacket/packet.h)
AC_CHECK_HEADERS(net/pfvar.h, , , [#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>])
if test "$ac_cv_header_net_pfvar_h" = yes; then
        #
        # Check for various PF actions.
        #
        AC_MSG_CHECKING(whether net/pfvar.h defines PF_NAT through PF_NORDR)
        AC_TRY_COMPILE(
            [#include <sys/types.h>
            #include <sys/socket.h>
            #include <net/if.h>
            #include <net/pfvar.h>],
            [return PF_NAT+PF_NONAT+PF_BINAT+PF_NOBINAT+PF_RDR+PF_NORDR;],
            [
                AC_MSG_RESULT(yes)
                AC_DEFINE(HAVE_PF_NAT_THROUGH_PF_NORDR, 1,
                    [define if net/pfvar.h defines PF_NAT through PF_NORDR])
            ],
            AC_MSG_RESULT(no))
fi

case "$host_os" in
linux*|uclinux*)
        AC_CHECK_HEADERS(linux/sockios.h linux/if_bonding.h,,,
        [
#include <sys/socket.h>
#include <linux/if.h>
        ])
        ;;
esac

AC_LBL_FIXINCLUDES

AC_CHECK_FUNCS(strerror strerror_r strerror_s strlcpy strlcat)

needsnprintf=no
AC_CHECK_FUNCS(vsnprintf snprintf,,
        [needsnprintf=yes])
if test $needsnprintf = yes; then
        AC_LIBOBJ([snprintf])
fi

needstrtok_r=no
AC_CHECK_FUNCS(strtok_r,,
        [needstrtok_r=yes])
if test $needstrtok_r = yes; then
        AC_LIBOBJ([strtok_r])
fi

#
# Do we have ffs(), and is it declared in <strings.h>?
#
AC_CHECK_FUNCS(ffs)
if test "$ac_cv_func_ffs" = yes; then
        #
        # We have ffs(); is it declared in <strings.h>?
        #
        # This test fails if we don't have <strings.h> or if we do
        # but it doesn't declare ffs().
        #
        AC_CHECK_DECL(ffs,
            [
                AC_DEFINE(STRINGS_H_DECLARES_FFS,,
                    [Define to 1 if strings.h declares `ffs'])
            ],,
            [
#include <strings.h>
            ])
fi

#
# Do this before checking for ether_hostton(), as it's a
# "getaddrinfo()-ish function".
#
AC_LBL_LIBRARY_NET

#
# Check for reentrant versions of getnetbyname_r(), as provided by
# Linux (glibc), Solaris/IRIX, and AIX (with three different APIs!).
# If we don't find one, we just use getnetbyname(), which uses
# thread-specific data on many platforms, but doesn't use it on
# NetBSD or OpenBSD, and may not use it on older versions of other
# platforms.
#
# Only do the check if we have a declaration of getnetbyname_r();
# without it, we can't check which API it has.  (We assume that
# if there's a declaration, it has a prototype, so that the API
# can be checked.)
#
AC_CHECK_DECL(getnetbyname_r,
    [
        AC_MSG_CHECKING([for the Linux getnetbyname_r()])
        AC_TRY_LINK(
            [#include <netdb.h>],
            [
                struct netent netent_buf;
                char buf[1024];
                struct netent *resultp;
                int h_errnoval;

                return getnetbyname_r((const char *)0, &netent_buf, buf, sizeof buf, &resultp, &h_errnoval);
            ],
            [
                AC_MSG_RESULT(yes)
                AC_DEFINE(HAVE_LINUX_GETNETBYNAME_R, 1,
                    [define if we have the Linux getnetbyname_r()])
            ],
            [
                AC_MSG_RESULT(no)

                AC_MSG_CHECKING([for Solaris/IRIX getnetbyname_r()])
                AC_TRY_LINK(
                    [#include <netdb.h>],
                    [
                        struct netent netent_buf;
                        char buf[1024];

                        return getnetbyname_r((const char *)0, &netent_buf, buf, (int)sizeof buf) != NULL;
                    ],
                    [
                        AC_MSG_RESULT(yes)
                        AC_DEFINE(HAVE_SOLARIS_IRIX_GETNETBYNAME_R, 1,
                            [define if we have the Solaris/IRIX getnetbyname_r()])
                    ],
                    [
                        AC_MSG_RESULT(no)

                        AC_MSG_CHECKING([for AIX getnetbyname_r()])
                        AC_TRY_LINK(
                            [#include <netdb.h>],
                            [
                                struct netent netent_buf;
                                struct netent_data net_data;

                                return getnetbyname_r((const char *)0, &netent_buf, &net_data);
                            ],
                            [
                                AC_MSG_RESULT(yes)
                                AC_DEFINE(HAVE_AIX_GETNETBYNAME_R, 1,
                                    [define if we have the AIX getnetbyname_r()])
                            ],
                            [
                                AC_MSG_RESULT(no)
                            ])
                    ])
            ])
    ],,[#include <netdb.h>])

#
# Check for reentrant versions of getprotobyname_r(), as provided by
# Linux (glibc), Solaris/IRIX, and AIX (with three different APIs!).
# If we don't find one, we just use getprotobyname(), which uses
# thread-specific data on many platforms, but doesn't use it on
# NetBSD or OpenBSD, and may not use it on older versions of other
# platforms.
#
# Only do the check if we have a declaration of getprotobyname_r();
# without it, we can't check which API it has.  (We assume that
# if there's a declaration, it has a prototype, so that the API
# can be checked.)
#
AC_CHECK_DECL(getprotobyname_r,
    [
        AC_MSG_CHECKING([for the Linux getprotobyname_r()])
        AC_TRY_LINK(
            [#include <netdb.h>],
            [
                struct protoent protoent_buf;
                char buf[1024];
                struct protoent *resultp;

                return getprotobyname_r((const char *)0, &protoent_buf, buf, sizeof buf, &resultp);
            ],
            [
                AC_MSG_RESULT(yes)
                AC_DEFINE(HAVE_LINUX_GETPROTOBYNAME_R, 1,
                    [define if we have the Linux getprotobyname_r()])
            ],
            [
                AC_MSG_RESULT(no)

                AC_MSG_CHECKING([for Solaris/IRIX getprotobyname_r()])
                AC_TRY_LINK(
                    [#include <netdb.h>],
                    [
                        struct protoent protoent_buf;
                        char buf[1024];

                        return getprotobyname_r((const char *)0, &protoent_buf, buf, (int)sizeof buf) != NULL;
                    ],
                    [
                        AC_MSG_RESULT(yes)
                        AC_DEFINE(HAVE_SOLARIS_IRIX_GETPROTOBYNAME_R, 1,
                            [define if we have the Solaris/IRIX getprotobyname_r()])
                    ],
                    [
                        AC_MSG_RESULT(no)

                        AC_MSG_CHECKING([for AIX getprotobyname_r()])
                        AC_TRY_LINK(
                            [#include <netdb.h>],
                            [
                                struct protoent protoent_buf;
                                struct protoent_data proto_data;

                                return getprotobyname_r((const char *)0, &protoent_buf, &proto_data);
                            ],
                            [
                                AC_MSG_RESULT(yes)
                                AC_DEFINE(HAVE_AIX_GETPROTOBYNAME_R, 1,
                                    [define if we have the AIX getprotobyname_r()])
                            ],
                            [
                                AC_MSG_RESULT(no)
                            ])
                    ])
            ])
    ],,[#include <netdb.h>])

#
# You are in a twisty little maze of UN*Xes, all different.
# Some might not have ether_hostton().
# Some might have it and declare it in <net/ethernet.h>.
# Some might have it and declare it in <netinet/ether.h>
# Some might have it and declare it in <sys/ethernet.h>.
# Some might have it and declare it in <arpa/inet.h>.
# Some might have it and declare it in <netinet/if_ether.h>.
# Some might have it and not declare it in any header file.
#
# Before you is a C compiler.
#
AC_CHECK_FUNCS(ether_hostton)
if test "$ac_cv_func_ether_hostton" = yes; then
        #
        # OK, we have ether_hostton().  Is it declared in <net/ethernet.h>?
        #
        # This test fails if we don't have <net/ethernet.h> or if we do
        # but it doesn't declare ether_hostton().
        #
        AC_CHECK_DECL(ether_hostton,
            [
                AC_DEFINE(NET_ETHERNET_H_DECLARES_ETHER_HOSTTON,,
                    [Define to 1 if net/ethernet.h declares `ether_hostton'])
            ],,
            [
#include <net/ethernet.h>
            ])
        #
        # Did that succeed?
        #
        if test "$ac_cv_have_decl_ether_hostton" != yes; then
                #
                # No, how about <netinet/ether.h>, as on Linux?
                #
                # This test fails if we don't have <netinet/ether.h>
                # or if we do but it doesn't declare ether_hostton().
                #
                # Unset ac_cv_have_decl_ether_hostton so we don't
                # treat the previous failure as a cached value and
                # suppress the next test.
                #
                unset ac_cv_have_decl_ether_hostton
                AC_CHECK_DECL(ether_hostton,
                    [
                        AC_DEFINE(NETINET_ETHER_H_DECLARES_ETHER_HOSTTON,,
                            [Define to 1 if netinet/ether.h declares `ether_hostton'])
                    ],,
                    [
#include <netinet/ether.h>
                    ])
        fi
        #
        # Did that succeed?
        #
        if test "$ac_cv_have_decl_ether_hostton" != yes; then
                #
                # No, how about <sys/ethernet.h>, as on Solaris 10
                # and later?
                #
                # This test fails if we don't have <sys/ethernet.h>
                # or if we do but it doesn't declare ether_hostton().
                #
                # Unset ac_cv_have_decl_ether_hostton so we don't
                # treat the previous failure as a cached value and
                # suppress the next test.
                #
                unset ac_cv_have_decl_ether_hostton
                AC_CHECK_DECL(ether_hostton,
                    [
                        AC_DEFINE(SYS_ETHERNET_H_DECLARES_ETHER_HOSTTON,,
                            [Define to 1 if sys/ethernet.h declares `ether_hostton'])
                    ],,
                    [
#include <sys/ethernet.h>
                    ])
        fi
        #
        # Did that succeed?
        #
        if test "$ac_cv_have_decl_ether_hostton" != yes; then
                #
                # No, how about <arpa/inet.h>, as in AIX?
                #
                # This test fails if we don't have <arpa/inet.h>
                # (if we have ether_hostton(), we should have
                # networking, and if we have networking, we should
                # have <arapa/inet.h>) or if we do but it doesn't
                # declare ether_hostton().
                #
                # Unset ac_cv_have_decl_ether_hostton so we don't
                # treat the previous failure as a cached value and
                # suppress the next test.
                #
                unset ac_cv_have_decl_ether_hostton
                AC_CHECK_DECL(ether_hostton,
                    [
                        AC_DEFINE(ARPA_INET_H_DECLARES_ETHER_HOSTTON,,
                            [Define to 1 if arpa/inet.h declares `ether_hostton'])
                    ],,
                    [
#include <arpa/inet.h>
                    ])
        fi
        #
        # Did that succeed?
        #
        if test "$ac_cv_have_decl_ether_hostton" != yes; then
                #
                # No, how about <netinet/if_ether.h>?
                # On some platforms, it requires <net/if.h> and
                # <netinet/in.h>, and we always include it with
                # both of them, so test it with both of them.
                #
                # This test fails if we don't have <netinet/if_ether.h>
                # and the headers we include before it, or if we do but
                # <netinet/if_ether.h> doesn't declare ether_hostton().
                #
                # Unset ac_cv_have_decl_ether_hostton so we don't
                # treat the previous failure as a cached value and
                # suppress the next test.
                #
                unset ac_cv_have_decl_ether_hostton
                AC_CHECK_DECL(ether_hostton,
                    [
                        AC_DEFINE(NETINET_IF_ETHER_H_DECLARES_ETHER_HOSTTON,,
                            [Define to 1 if netinet/if_ether.h declares `ether_hostton'])
                    ],,
                    [
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
                    ])
        fi
        #
        # After all that, is ether_hostton() declared?
        #
        if test "$ac_cv_have_decl_ether_hostton" = yes; then
                #
                # Yes.
                #
                AC_DEFINE(HAVE_DECL_ETHER_HOSTTON, 1,
                    [Define to 1 if you have the declaration of `ether_hostton'])
        else
                #
                # No, we'll have to declare it ourselves.
                # Do we have "struct ether_addr" if we include
                # <netinet/if_ether.h>?
                #
                AC_CHECK_TYPES(struct ether_addr,,,
                    [
                        #include <sys/types.h>
                        #include <sys/socket.h>
                        #include <net/if.h>
                        #include <netinet/in.h>
                        #include <netinet/if_ether.h>
                    ])
        fi
fi

#
# For various things that might use pthreads.
#
AC_CHECK_HEADER(pthread.h,
    [
        #
        # OK, we have pthread.h.  Do we have pthread_create in the
        # system libraries?
        #
        AC_CHECK_FUNC(pthread_create,
            [
                #
                # Yes.
                #
                ac_lbl_have_pthreads="found"
            ],
            [
                #
                # No - do we have it in -lpthreads?
                #
                AC_CHECK_LIB(pthreads, pthread_create,
                    [
                        #
                        # Yes - add -lpthreads.
                        #
                        ac_lbl_have_pthreads="found"
                        PTHREAD_LIBS="$PTHREAD_LIBS -lpthreads"
                    ],
                    [
                        #
                        # No - do we have it in -lpthread?
                        #
                        AC_CHECK_LIB(pthread, pthread_create,
                            [
                                #
                                # Yes - add -lpthread.
                                #
                                ac_lbl_have_pthreads="found"
                                PTHREAD_LIBS="$PTHREAD_LIBS -lpthread"
                            ],
                            [
                                #
                                # No.
                                #
                                ac_lbl_have_pthreads="not found"
                            ])
                    ])
            ])
    ],
    [
        #
        # We didn't find pthread.h.
        #
        ac_lbl_have_pthreads="not found"
    ]
)

dnl to pacify those who hate protochain insn
AC_MSG_CHECKING(if --disable-protochain option is specified)
AC_ARG_ENABLE(protochain,
AC_HELP_STRING([--disable-protochain],[disable \"protochain\" insn]))
case "x$enable_protochain" in
xyes)   enable_protochain=enabled       ;;
xno)    enable_protochain=disabled      ;;
x)      enable_protochain=enabled       ;;
esac

if test "$enable_protochain" = "disabled"; then
        AC_DEFINE(NO_PROTOCHAIN,1,[do not use protochain])
fi
AC_MSG_RESULT(${enable_protochain})

#
# valgrindtest directly uses the native capture mechanism, but
# only tests with BPF and PF_PACKET sockets; only enable it if
# we have BPF or PF_PACKET sockets.
#
VALGRINDTEST_SRC=

#
# SITA support is mutually exclusive with native capture support;
# "--with-sita" selects SITA support.
#
AC_ARG_WITH(sita,
AC_HELP_STRING([--with-sita],[include SITA support]),
[
        if test ! "x$withval" = "xno" ; then
                AC_DEFINE(SITA,1,[include ACN support])
                AC_MSG_NOTICE(Enabling SITA ACN support)
                V_PCAP=sita
        fi
],
[
AC_ARG_WITH(pcap,
AC_HELP_STRING([--with-pcap=TYPE],[use packet capture TYPE]))
if test ! -z "$with_pcap" ; then
        V_PCAP="$withval"
else
        #
        # Check for a bunch of headers for various packet
        # capture mechanisms.
        #
        AC_CHECK_HEADERS(net/bpf.h)
        if test "$ac_cv_header_net_bpf_h" = yes; then
                #
                # Does it define BIOCSETIF?
                # I.e., is it a header for an LBL/BSD-style capture
                # mechanism, or is it just a header for a BPF filter
                # engine?  Some versions of Arch Linux, for example,
                # have a net/bpf.h that doesn't define BIOCSETIF;
                # as it's a Linux, it should use packet sockets,
                # instead.
                #
                # We need:
                #
                #  sys/types.h, because FreeBSD 10's net/bpf.h
                #  requires that various BSD-style integer types
                #  be defined;
                #
                #  sys/ioctl.h and, if we have it, sys/ioccom.h,
                #  because net/bpf.h defines ioctls;
                #
                #  net/if.h, because it defines some structures
                #  used in ioctls defined by net/bpf.h;
                #
                #  sys/socket.h, because OpenBSD 5.9's net/bpf.h
                #  defines some structure fields as being
                #  struct sockaddrs;
                #
                # and net/bpf.h doesn't necessarily include all
                # of those headers itself.
                #
                AC_MSG_CHECKING(if net/bpf.h defines BIOCSETIF)
                AC_CACHE_VAL(ac_cv_lbl_bpf_h_defines_biocsetif,
                        AC_TRY_COMPILE(
[
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_IOCCOM_H
#include <sys/ioccom.h>
#endif
#include <net/bpf.h>
#include <net/if.h>
],
                        [u_int i = BIOCSETIF;],
                        ac_cv_lbl_bpf_h_defines_biocsetif=yes,
                        ac_cv_lbl_bpf_h_defines_biocsetif=no))
                AC_MSG_RESULT($ac_cv_lbl_bpf_h_defines_biocsetif)
        fi
        AC_CHECK_HEADERS(net/pfilt.h net/enet.h)
        AC_CHECK_HEADERS(net/nit.h sys/net/nit.h)
        AC_CHECK_HEADERS(linux/socket.h net/raw.h sys/dlpi.h)

        if test "$ac_cv_lbl_bpf_h_defines_biocsetif" = yes; then
                #
                # BPF.
                # Check this before DLPI, so that we pick BPF on
                # Solaris 11 and later.
                #
                V_PCAP=bpf

                #
                # We have BPF, so build valgrindtest with "make test"
                # on macOS and FreeBSD (add your OS once there's a
                # valgrind for it).
                #
                case "$host_os" in

                freebsd*|darwin*|linux*)
                        VALGRINDTEST_SRC=valgrindtest.c
                        ;;
                esac
        elif test "$ac_cv_header_linux_socket_h" = yes; then
                #
                # No prizes for guessing this one.
                #
                V_PCAP=linux

                #
                # XXX - this won't work with older kernels that have
                # SOCK_PACKET sockets but not PF_PACKET sockets.
                #
                VALGRINDTEST_SRC=valgrindtest.c
        elif test "$ac_cv_header_net_pfilt_h" = yes; then
                #
                # DEC OSF/1, Digital UNIX, Tru64 UNIX
                #
                V_PCAP=pf
        elif test "$ac_cv_header_net_enet_h" = yes; then
                #
                # Stanford Enetfilter.
                #
                V_PCAP=enet
        elif test "$ac_cv_header_net_nit_h" = yes; then
                #
                # SunOS 4.x STREAMS NIT.
                #
                V_PCAP=snit
        elif test "$ac_cv_header_sys_net_nit_h" = yes; then
                #
                # Pre-SunOS 4.x non-STREAMS NIT.
                #
                V_PCAP=nit
        elif test "$ac_cv_header_net_raw_h" = yes; then
                #
                # IRIX snoop.
                #
                V_PCAP=snoop
        elif test "$ac_cv_header_sys_dlpi_h" = yes; then
                #
                # DLPI on pre-Solaris 11 SunOS 5, HP-UX, possibly others.
                #
                V_PCAP=dlpi
        else
                #
                # Nothing we support.
                #
                V_PCAP=null
                AC_MSG_WARN(cannot determine packet capture interface)
                AC_MSG_WARN((see the INSTALL doc for more info))
        fi
fi
AC_MSG_CHECKING(packet capture type)
AC_MSG_RESULT($V_PCAP)
AC_SUBST(VALGRINDTEST_SRC)

#
# Do capture-mechanism-dependent tests.
#
case "$V_PCAP" in
dlpi)
        #
        # Needed for common functions used by pcap-[dlpi,libdlpi].c
        #
        SSRC="dlpisubs.c"

        #
        # Checks for some header files.
        #
        AC_CHECK_HEADERS(sys/bufmod.h sys/dlpi_ext.h)

        #
        # Checks to see if Solaris has the public libdlpi(3LIB) library.
        # Note: The existence of /usr/include/libdlpi.h does not mean it is the
        # public libdlpi(3LIB) version. Before libdlpi was made public, a
        # private version also existed, which did not have the same APIs.
        # Due to a gcc bug, the default search path for 32-bit libraries does
        # not include /lib, we add it explicitly here.
        # [http://bugs.opensolaris.org/view_bug.do?bug_id=6619485].
        # Also, due to the bug above applications that link to libpcap with
        # libdlpi will have to add "-L/lib" option to "configure".
        #
        saved_ldflags=$LDFLAGS
        LDFLAGS="$LIBS -L/lib"
        AC_CHECK_LIB(dlpi, dlpi_walk,
                [
                        LIBS="-ldlpi $LIBS"
                        V_PCAP=libdlpi
                        AC_DEFINE(HAVE_LIBDLPI,1,[if libdlpi exists])
                ],
                V_PCAP=dlpi)
        LDFLAGS=$saved_ldflags

        #
        # Checks whether <sys/dlpi.h> is usable, to catch weird SCO
        # versions of DLPI.
        #
        AC_MSG_CHECKING(whether <sys/dlpi.h> is usable)
        AC_CACHE_VAL(ac_cv_sys_dlpi_usable,
                AC_TRY_COMPILE(
                    [
                        #include <sys/types.h>
                        #include <sys/time.h>
                        #include <sys/dlpi.h>
                    ],
                    [int i = DL_PROMISC_PHYS;],
                    ac_cv_sys_dlpi_usable=yes,
                    ac_cv_sys_dlpi_usable=no))
        AC_MSG_RESULT($ac_cv_sys_dlpi_usable)
        if test $ac_cv_sys_dlpi_usable = no ; then
                AC_MSG_ERROR(<sys/dlpi.h> is not usable on this system; it probably has a non-standard DLPI)
        fi

        #
        # Check to see if Solaris has the dl_passive_req_t struct defined
        # in <sys/dlpi.h>.
        # This check is for DLPI support for passive modes.
        # See dlpi(7P) for more details.
        #
        AC_CHECK_TYPES(dl_passive_req_t,,,
            [
                #include <sys/types.h>
                #include <sys/dlpi.h>
            ])
        ;;

linux)
        #
        # Do we have the wireless extensions?
        #
        AC_CHECK_HEADERS(linux/wireless.h, [], [],
        [
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/types.h>
        ])

        #
        # Do we have libnl?
        #
        AC_ARG_WITH(libnl,
        AC_HELP_STRING([--without-libnl],[disable libnl support @<:@default=yes, on Linux, if present@:>@]),
                with_libnl=$withval,with_libnl=if_available)

        if test x$with_libnl != xno ; then
                have_any_nl="no"

                incdir=-I/usr/include/libnl3
                libnldir=
                case "$with_libnl" in

                yes|if_available)
                  ;;

                *)
                  if test -d $withval; then
                    libnldir=-L${withval}/lib/.libs
                    incdir=-I${withval}/include
                  fi
                  ;;
                esac

                #
                # Try libnl 3.x first.
                #
                AC_CHECK_LIB(nl-3, nl_socket_alloc,
                [
                        #
                        # Yes, we have libnl 3.x.
                        #
                        LIBS="${libnldir} -lnl-genl-3 -lnl-3 $LIBS"
                        AC_DEFINE(HAVE_LIBNL,1,[if libnl exists])
                        AC_DEFINE(HAVE_LIBNL_3_x,1,[if libnl exists and is version 3.x])
                        AC_DEFINE(HAVE_LIBNL_NLE,1,[libnl has NLE_FAILURE])
                        AC_DEFINE(HAVE_LIBNL_SOCKETS,1,[libnl has new-style socket api])
                        V_INCLS="$V_INCLS ${incdir}"
                        have_any_nl="yes"
                ],[], ${incdir} ${libnldir} -lnl-genl-3 -lnl-3 )

                if test x$have_any_nl = xno ; then
                        #
                        # Try libnl 2.x
                        #
                        AC_CHECK_LIB(nl, nl_socket_alloc,
                        [
                                #
                                # Yes, we have libnl 2.x.
                                #
                                LIBS="${libnldir} -lnl-genl -lnl $LIBS"
                                AC_DEFINE(HAVE_LIBNL,1,[if libnl exists])
                                AC_DEFINE(HAVE_LIBNL_2_x,1,[if libnl exists and is version 2.x])
                                AC_DEFINE(HAVE_LIBNL_NLE,1,[libnl has NLE_FAILURE])
                                AC_DEFINE(HAVE_LIBNL_SOCKETS,1,[libnl has new-style socket api])
                                have_any_nl="yes"
                        ])
                fi

                if test x$have_any_nl = xno ; then
                        #
                        # No, we don't; do we have libnl 1.x?
                        #
                        AC_CHECK_LIB(nl, nl_handle_alloc,
                        [
                                #
                                # Yes.
                                #
                                LIBS="${libnldir} -lnl $LIBS"
                                AC_DEFINE(HAVE_LIBNL,1,[if libnl exists])
                                have_any_nl="yes"
                        ])
                fi

                if test x$have_any_nl = xno ; then
                        #
                        # No, we don't have libnl at all.
                        #
                        if test x$with_libnl = xyes ; then
                                AC_MSG_ERROR([libnl support requested but libnl not found])
                        fi
                fi
        fi

        AC_CHECK_HEADERS(linux/ethtool.h,,,
            [
AC_INCLUDES_DEFAULT
#include <linux/types.h>
            ])

        #
        # Check to see if struct tpacket_stats is defined in
        # <linux/if_packet.h>.  If so, then pcap-linux.c can use this
        # to report proper statistics.
        #
        # -Scott Barron
        #
        AC_CHECK_TYPES(struct tpacket_stats,,,
            [
                #include <linux/if_packet.h>
            ])

        #
        # Check to see if the tpacket_auxdata struct has a tp_vlan_tci member.
        #
        # NOTE: any failure means we conclude that it doesn't have that
        # member, so if we don't have tpacket_auxdata, we conclude it
        # doesn't have that member (which is OK, as either we won't be
        # using code that would use that member, or we wouldn't compile
        # in any case).
        AC_CHECK_MEMBERS([struct tpacket_auxdata.tp_vlan_tci],,,
            [
                #include <sys/types.h>
                #include <linux/if_packet.h>
            ])
        ;;

bpf)
        #
        # Check whether we have the *BSD-style ioctls.
        #
        AC_CHECK_HEADERS(net/if_media.h)

        #
        # Check whether we have struct BPF_TIMEVAL.
        #
        AC_CHECK_TYPES(struct BPF_TIMEVAL,,,
            [
                #include <sys/types.h>
                #include <sys/ioctl.h>
                #ifdef HAVE_SYS_IOCCOM_H
                #include <sys/ioccom.h>
                #endif
                #include <net/bpf.h>
            ])
        ;;

dag)
        #
        # --with-pcap=dag is the only way to get here, and it means
        # "DAG support but nothing else"
        #
        V_DEFS="$V_DEFS -DDAG_ONLY"
        xxx_only=yes
        ;;

septel)
        #
        # --with-pcap=septel is the only way to get here, and it means
        # "Septel support but nothing else"
        #
        V_DEFS="$V_DEFS -DSEPTEL_ONLY"
        xxx_only=yes
        ;;

snf)
        #
        # --with-pcap=snf is the only way to get here, and it means
        # "SNF support but nothing else"
        #
        V_DEFS="$V_DEFS -DSNF_ONLY"
        xxx_only=yes
        ;;

null)
        ;;

*)
        AC_MSG_ERROR($V_PCAP is not a valid pcap type)
        ;;
esac

dnl
dnl Now figure out how we get a list of interfaces and addresses,
dnl if we support capturing.  Don't bother if we don't support
dnl capturing.
dnl
if test "$V_PCAP" != null
then
        AC_CHECK_FUNC(getifaddrs,[
                #
                # We have "getifaddrs()"; make sure we have <ifaddrs.h>
                # as well, just in case some platform is really weird.
                #
                AC_CHECK_HEADER(ifaddrs.h,[
                    #
                    # We have the header, so we use "getifaddrs()" to
                    # get the list of interfaces.
                    #
                    V_FINDALLDEVS=fad-getad.c
                ],[
                    #
                    # We don't have the header - give up.
                    # XXX - we could also fall back on some other
                    # mechanism, but, for now, this'll catch this
                    # problem so that we can at least try to figure
                    # out something to do on systems with "getifaddrs()"
                    # but without "ifaddrs.h", if there is something
                    # we can do on those systems.
                    #
                    AC_MSG_ERROR([Your system has getifaddrs() but doesn't have a usable <ifaddrs.h>.])
                ])
        ],[
                #
                # Well, we don't have "getifaddrs()", at least not with the
                # libraries with which we've decided we need to link
                # libpcap with, so we have to use some other mechanism.
                #
                # Note that this may happen on Solaris, which has
                # getifaddrs(), but in -lsocket, not in -lxnet, so we
                # won't find it if we link with -lxnet, which we want
                # to do for other reasons.
                #
                # For now, we use either the SIOCGIFCONF ioctl or the
                # SIOCGLIFCONF ioctl, preferring the latter if we have
                # it; the latter is a Solarisism that first appeared
                # in Solaris 8.  (Solaris's getifaddrs() appears to
                # be built atop SIOCGLIFCONF; using it directly
                # avoids a not-all-that-useful middleman.)
                #
                AC_MSG_CHECKING(whether we have SIOCGLIFCONF)
                AC_CACHE_VAL(ac_cv_lbl_have_siocglifconf,
                    AC_TRY_COMPILE(
                        [#include <sys/param.h>
                        #include <sys/file.h>
                        #include <sys/ioctl.h>
                        #include <sys/socket.h>
                        #include <sys/sockio.h>],
                        [ioctl(0, SIOCGLIFCONF, (char *)0);],
                        ac_cv_lbl_have_siocglifconf=yes,
                        ac_cv_lbl_have_siocglifconf=no))
                AC_MSG_RESULT($ac_cv_lbl_have_siocglifconf)
                if test $ac_cv_lbl_have_siocglifconf = yes ; then
                        V_FINDALLDEVS=fad-glifc.c
                else
                        V_FINDALLDEVS=fad-gifc.c
                fi
        ])
fi
])

dnl check for hardware timestamp support
case "$host_os" in
linux*)
        AC_CHECK_HEADERS([linux/net_tstamp.h])
        ;;
*)
        AC_MSG_NOTICE(no hardware timestamp support implemented for $host_os)
        ;;
esac

AC_ARG_ENABLE([packet-ring],
[AC_HELP_STRING([--enable-packet-ring],[enable packet ring support on Linux @<:@default=yes@:>@])],
,enable_packet_ring=yes)

if test "x$enable_packet_ring" != "xno" ; then
        AC_DEFINE(PCAP_SUPPORT_PACKET_RING, 1, [use packet ring capture support on Linux if available])
        AC_SUBST(PCAP_SUPPORT_PACKET_RING)
fi

#
# Check for socklen_t.
#
AC_CHECK_TYPES(socklen_t,,,
    [
        #include <sys/types.h>
        #include <sys/socket.h>
    ])

AC_ARG_ENABLE(ipv6,
AC_HELP_STRING([--enable-ipv6],[build IPv6-capable version @<:@default=yes@:>@]),
    [],
    [enable_ipv6=yes])
if test "$enable_ipv6" != "no"; then
        #
        # We've already made sure we have getaddrinfo above in
        # AC_LBL_LIBRARY_NET.
        #
        AC_DEFINE(INET6,1,[IPv6])
fi

# Check for Endace DAG card support.
AC_ARG_WITH([dag],
AC_HELP_STRING([--with-dag@<:@=DIR@:>@],[include Endace DAG support (located in directory DIR, if supplied).  @<:@default=yes, if present@:>@]),
[
        if test "$withval" = no
        then
                # User doesn't want DAG support.
                want_dag=no
        elif test "$withval" = yes
        then
                # User wants DAG support but hasn't specified a directory.
                want_dag=yes
        else
                # User wants DAG support and has specified a directory, so use the provided value.
                want_dag=yes
                dag_root=$withval
        fi
],[
        if test "$V_PCAP" = dag; then
                # User requested DAG-only libpcap, so we'd better have
                # the DAG API.
                want_dag=yes
        elif test "xxx_only" = yes; then
                # User requested something-else-only pcap, so they don't
                # want DAG support.
                want_dag=no
        else
                #
                # Use DAG API if present, otherwise don't
                #
                want_dag=ifpresent
        fi
])

AC_ARG_WITH([dag-includes],
AC_HELP_STRING([--with-dag-includes=IDIR],[Endace DAG include directory, if not DIR/include]),
[
        # User wants DAG support and has specified a header directory, so use the provided value.
        want_dag=yes
        dag_include_dir=$withval
],[])

AC_ARG_WITH([dag-libraries],
AC_HELP_STRING([--with-dag-libraries=LDIR],[Endace DAG library directory, if not DIR/lib]),
[
        # User wants DAG support and has specified a library directory, so use the provided value.
        want_dag=yes
        dag_lib_dir=$withval
],[])

if test "$want_dag" != no; then

        # If necessary, set default paths for DAG API headers and libraries.
        if test -z "$dag_root"; then
                dag_root=/usr/local
        fi

        if test -z "$dag_include_dir"; then
                dag_include_dir="$dag_root/include"
        fi

        if test -z "$dag_lib_dir"; then
                dag_lib_dir="$dag_root/lib"
        fi

        V_INCLS="$V_INCLS -I$dag_include_dir"

        AC_CHECK_HEADERS([dagapi.h])

        if test "$ac_cv_header_dagapi_h" = yes; then

                if test $V_PCAP != dag ; then
                         SSRC="$SSRC pcap-dag.c"
                fi

                # Check for various DAG API functions.
                # Don't need to save and restore LIBS to prevent -ldag being
                # included if there's a found-action (arg 3).
                saved_ldflags=$LDFLAGS
                LDFLAGS="-L$dag_lib_dir"
                AC_CHECK_LIB([dag], [dag_attach_stream],
                    [],
                    [AC_MSG_ERROR(DAG library lacks streams support)])
                AC_CHECK_LIB([dag], [dag_attach_stream64], [dag_large_streams="1"], [dag_large_streams="0"])
                AC_CHECK_LIB([dag],[dag_get_erf_types], [
                        AC_DEFINE(HAVE_DAG_GET_ERF_TYPES, 1, [define if you have dag_get_erf_types()])])
                AC_CHECK_LIB([dag],[dag_get_stream_erf_types], [
                        AC_DEFINE(HAVE_DAG_GET_STREAM_ERF_TYPES, 1, [define if you have dag_get_stream_erf_types()])])

                LDFLAGS=$saved_ldflags

                LIBS="$LIBS -ldag -ldagconf"
                LDFLAGS="$LDFLAGS -L$dag_lib_dir"

                if test "$dag_large_streams" = 1; then
                        AC_DEFINE(HAVE_DAG_LARGE_STREAMS_API, 1, [define if you have large streams capable DAG API])
                        AC_CHECK_LIB([vdag],[vdag_set_device_info], [ac_dag_have_vdag="1"], [ac_dag_have_vdag="0"])
                        if test "$ac_dag_have_vdag" = 1; then
                                AC_DEFINE(HAVE_DAG_VDAG, 1, [define if you have vdag_set_device_info()])
                                if test "$ac_lbl_have_pthreads" != "found"; then
                                        AC_MSG_ERROR([DAG requires pthreads, but we didn't find them])
                                fi
                                LIBS="$LIBS $PTHREAD_LIBS"
                        fi
                fi

                AC_DEFINE(HAVE_DAG_API, 1, [define if you have the DAG API])
        else

                if test "$V_PCAP" = dag; then
                        # User requested "dag" capture type but we couldn't
                        # find the DAG API support.
                        AC_MSG_ERROR([DAG support requested with --with-pcap=dag, but the DAG headers weren't found at $dag_include_dir: make sure the DAG support is installed, specify a different path or paths if necessary, or don't request DAG support])
                fi

                if test "$want_dag" = yes; then
                        # User wanted DAG support but we couldn't find it.
                        AC_MSG_ERROR([DAG support requested with --with-dag, but the DAG headers weren't found at $dag_include_dir: make sure the DAG support is installed, specify a different path or paths if necessary, or don't request DAG support])
                fi
        fi
fi

AC_ARG_WITH(septel,
AC_HELP_STRING([--with-septel@<:@=DIR@:>@],[include Septel support (located in directory DIR, if supplied).  @<:@default=yes, if present@:>@]),
[
        if test "$withval" = no
        then
                want_septel=no
        elif test "$withval" = yes
        then
                want_septel=yes
                septel_root=
        else
                want_septel=yes
                septel_root=$withval
        fi
],[
        if test "$V_PCAP" = septel; then
                # User requested Septel-only libpcap, so we'd better have
                # the Septel API.
                want_septel=yes
        elif test "xxx_only" = yes; then
                # User requested something-else-only pcap, so they don't
                # want Septel support.
                want_septel=no
        else
                #
                # Use Septel API if present, otherwise don't
                #
                want_septel=ifpresent
        fi
])

ac_cv_lbl_septel_api=no
if test "$with_septel" != no; then

        AC_MSG_CHECKING([whether we have Septel API headers])

        # If necessary, set default paths for Septel API headers and libraries.
        if test -z "$septel_root"; then
                septel_root=$srcdir/../septel
        fi

        septel_tools_dir="$septel_root"
        septel_include_dir="$septel_root/INC"

        if test -r "$septel_include_dir/msg.h"; then
                ac_cv_lbl_septel_api=yes
        fi

        if test "$ac_cv_lbl_septel_api" = yes; then
                AC_MSG_RESULT([yes ($septel_include_dir)])

                V_INCLS="$V_INCLS -I$septel_include_dir"
                ADDLOBJS="$ADDLOBJS $septel_tools_dir/asciibin.o $septel_tools_dir/bit2byte.o $septel_tools_dir/confirm.o $septel_tools_dir/fmtmsg.o $septel_tools_dir/gct_unix.o $septel_tools_dir/hqueue.o $septel_tools_dir/ident.o $septel_tools_dir/mem.o $septel_tools_dir/pack.o $septel_tools_dir/parse.o $septel_tools_dir/pool.o $septel_tools_dir/sdlsig.o $septel_tools_dir/strtonum.o $septel_tools_dir/timer.o $septel_tools_dir/trace.o"
                ADDLARCHIVEOBJS="$ADDLARCHIVEOBJS $septel_tools_dir/asciibin.o $septel_tools_dir/bit2byte.o $septel_tools_dir/confirm.o $septel_tools_dir/fmtmsg.o $septel_tools_dir/gct_unix.o $septel_tools_dir/hqueue.o $septel_tools_dir/ident.o $septel_tools_dir/mem.o $septel_tools_dir/pack.o $septel_tools_dir/parse.o $septel_tools_dir/pool.o $septel_tools_dir/sdlsig.o $septel_tools_dir/strtonum.o $septel_tools_dir/timer.o $septel_tools_dir/trace.o"

                if test "$V_PCAP" != septel ; then
                         SSRC="$SSRC pcap-septel.c"
                fi

                AC_DEFINE(HAVE_SEPTEL_API, 1, [define if you have the Septel API])
        else
                AC_MSG_RESULT(no)

                if test "$V_PCAP" = septel; then
                        # User requested "septel" capture type but
                        # we couldn't find the Septel API support.
                        AC_MSG_ERROR([Septel support requested with --with-pcap=septel, but the Septel headers weren't found at $septel_include_dir: make sure the Septel support is installed, specify a different path or paths if necessary, or don't request Septel support])
                fi

                if test "$want_septel" = yes; then
                        # User wanted Septel support but we couldn't find it.
                        AC_MSG_ERROR([Septel support requested with --with-septel, but the Septel headers weren't found at $septel_include_dir: make sure the Septel support is installed, specify a different path or paths if necessary, or don't request Septel support])
                fi
        fi
fi

# Check for Myricom SNF support.
AC_ARG_WITH([snf],
AC_HELP_STRING([--with-snf@<:@=DIR@:>@],[include Myricom SNF support (located in directory DIR, if supplied).  @<:@default=yes, if present@:>@]),
[
        if test "$withval" = no
        then
                # User explicitly doesn't want SNF
                want_snf=no
        elif test "$withval" = yes
        then
                # User wants SNF support but hasn't specified a directory.
                want_snf=yes
        else
                # User wants SNF support with a specified directory.
                want_snf=yes
                snf_root=$withval
        fi
],[
        if test "$V_PCAP" = snf; then
                # User requested Sniffer-only libpcap, so we'd better have
                # the Sniffer API.
                want_snf=yes
        elif test "xxx_only" = yes; then
                # User requested something-else-only pcap, so they don't
                # want SNF support.
                want_snf=no
        else
                #
                # Use Sniffer API if present, otherwise don't
                #
                want_snf=ifpresent
        fi
])

AC_ARG_WITH([snf-includes],
AC_HELP_STRING([--with-snf-includes=IDIR],[Myricom SNF include directory, if not DIR/include]),
[
        # User wants SNF with specific header directory
        want_snf=yes
        snf_include_dir=$withval
],[])

AC_ARG_WITH([snf-libraries],
AC_HELP_STRING([--with-snf-libraries=LDIR],[Myricom SNF library directory, if not DIR/lib]),
[
        # User wants SNF with specific lib directory
        want_snf=yes
        snf_lib_dir=$withval
],[])

ac_cv_lbl_snf_api=no
if test "$with_snf" != no; then

        AC_MSG_CHECKING(whether we have Myricom Sniffer API)

        # If necessary, set default paths for Sniffer headers and libraries.
        if test -z "$snf_root"; then
                snf_root=/opt/snf
        fi

        if test -z "$snf_include_dir"; then
                snf_include_dir="$snf_root/include"
        fi

        if test -z "$snf_lib_dir"; then
                snf_lib_dir="$snf_root/lib"
        fi

        if test -f "$snf_include_dir/snf.h"; then
                # We found a header; make sure we can link with the library
                saved_ldflags=$LDFLAGS
                LDFLAGS="$LDFLAGS -L$snf_lib_dir"
                AC_CHECK_LIB([snf], [snf_init], [ac_cv_lbl_snf_api="yes"])
                LDFLAGS="$saved_ldflags"
                if test "$ac_cv_lbl_snf_api" = no; then
                        AC_MSG_ERROR(SNF API cannot correctly be linked; check config.log)
                fi
        fi

        if test "$ac_cv_lbl_snf_api" = yes; then
                AC_MSG_RESULT([yes ($snf_root)])

                V_INCLS="$V_INCLS -I$snf_include_dir"
                LIBS="$LIBS -lsnf"
                LDFLAGS="$LDFLAGS -L$snf_lib_dir"

                if test "$V_PCAP" != snf ; then
                        SSRC="$SSRC pcap-snf.c"
                fi

                AC_DEFINE(HAVE_SNF_API, 1, [define if you have the Myricom SNF API])
        else
                AC_MSG_RESULT(no)

                if test "$want_snf" = yes; then
                        # User requested "snf" capture type but
                        # we couldn't find the Sniffer API support.
                        AC_MSG_ERROR([Myricom Sniffer support requested with --with-pcap=snf, but the Sniffer headers weren't found at $snf_include_dir: make sure the Sniffer support is installed, specify a different path or paths if necessary, or don't request Sniffer support])
                fi

                if test "$want_snf" = yes; then
                        AC_MSG_ERROR([Myricom Sniffer support requested with --with-snf, but the Sniffer headers weren't found at $snf_include_dir: make sure the Sniffer support is installed, specify a different path or paths if necessary, or don't request Sniffer support])
                fi
        fi
fi

# Check for Riverbed TurboCap support.
AC_ARG_WITH([turbocap],
AC_HELP_STRING([--with-turbocap@<:@=DIR@:>@],[include Riverbed TurboCap support (located in directory DIR, if supplied).  @<:@default=yes, if present@:>@]),
[
        if test "$withval" = no
        then
                # User explicitly doesn't want TurboCap
                want_turbocap=no
        elif test "$withval" = yes
        then
                # User wants TurboCap support but hasn't specified a directory.
                want_turbocap=yes
        else
                # User wants TurboCap support with a specified directory.
                want_turbocap=yes
                turbocap_root=$withval
        fi
],[
        if test "xxx_only" = yes; then
                # User requested something-else-only pcap, so they don't
                # want TurboCap support.
                want_turbocap=no
        else
                #
                # Use TurboCap API if present, otherwise don't
                #
                want_turbocap=ifpresent
        fi
])

ac_cv_lbl_turbocap_api=no
if test "$want_turbocap" != no; then

        AC_MSG_CHECKING(whether TurboCap is supported)

        save_CFLAGS="$CFLAGS"
        save_LIBS="$LIBS"
        if test ! -z "$turbocap_root"; then
                TURBOCAP_CFLAGS="-I$turbocap_root/include"
                TURBOCAP_LIBS="-L$turbocap_root/lib"
                CFLAGS="$CFLAGS $TURBOCAP_CFLAGS"
        fi

        AC_TRY_COMPILE(
        [
            #include <TcApi.h>
        ],
        [
            TC_INSTANCE a; TC_PORT b; TC_BOARD c;
            TC_INSTANCE i;
            (void)TcInstanceCreateByName("foo", &i);
        ],
        ac_cv_lbl_turbocap_api=yes)

        CFLAGS="$save_CFLAGS"
        if test $ac_cv_lbl_turbocap_api = yes; then
                AC_MSG_RESULT(yes)

                SSRC="$SSRC pcap-tc.c"
                V_INCLS="$V_INCLS $TURBOCAP_CFLAGS"
                LIBS="$LIBS $TURBOCAP_LIBS -lTcApi -lpthread -lstdc++"

                AC_DEFINE(HAVE_TC_API, 1, [define if you have the TurboCap API])
        else
                AC_MSG_RESULT(no)

                if test "$want_turbocap" = yes; then
                        # User wanted Turbo support but we couldn't find it.
                        AC_MSG_ERROR([TurboCap support requested with --with-turbocap, but the TurboCap headers weren't found: make sure the TurboCap support is installed or don't request TurboCap support])
                fi
        fi
fi

dnl
dnl Allow the user to enable remote capture.
dnl It's off by default, as that increases the attack surface of
dnl libpcap, exposing it to malicious servers.
dnl
AC_MSG_CHECKING([whether to enable remote packet capture])
AC_ARG_ENABLE(remote,
[  --enable-remote         enable remote packet capture @<:@default=no@:>@
  --disable-remote        disable remote packet capture],,
   enableval=no)
case "$enableval" in
yes)    AC_MSG_RESULT(yes)
        AC_WARN([Remote packet capture may expose libpcap-based applications])
        AC_WARN([to attacks by malicious remote capture servers!])
        #
        # rpcapd requires pthreads on UN*X.
        #
        if test "$ac_lbl_have_pthreads" != "found"; then
                AC_MSG_ERROR([rpcapd requires pthreads, but we didn't find them])
        fi
        #
        # It also requires crypt().
        # Do we have it in the system libraries?
        #
        AC_CHECK_FUNC(crypt,,
            [
                #
                # No.  Do we have it in -lcrypt?
                #
                AC_CHECK_LIB(crypt, crypt,
                    [
                        #
                        # Yes; add -lcrypt to the libraries for rpcapd.
                        #
                        RPCAPD_LIBS="$RPCAPD_LIBS -lcrypt"
                    ],
                    [
                        AC_MSG_ERROR([rpcapd requires crypt(), but we didn't find it])
                    ])
            ])

        #
        # OK, we have crypt().  Do we have getspnam()?
        #
        AC_CHECK_FUNCS(getspnam)

        #
        # Check for various members of struct msghdr.
        #
        AC_CHECK_MEMBERS([struct msghdr.msg_control],,,
            [
                #include "ftmacros.h"
                #include <sys/socket.h>
            ])
        AC_CHECK_MEMBERS([struct msghdr.msg_flags],,,
            [
                #include "ftmacros.h"
                #include <sys/socket.h>
            ])

        AC_DEFINE(ENABLE_REMOTE,,
            [Define to 1 if remote packet capture is to be supported])
        SSRC="$SSRC pcap-new.c pcap-rpcap.c rpcap-protocol.c sockutils.c"
        BUILD_RPCAPD=build-rpcapd
        INSTALL_RPCAPD=install-rpcapd
        ;;
*)      AC_MSG_RESULT(no)
        ;;
esac

AC_MSG_CHECKING(whether to build optimizer debugging code)
AC_ARG_ENABLE(optimizer-dbg,
AC_HELP_STRING([--enable-optimizer-dbg],[build optimizer debugging code]))
if test "$enable_optimizer_dbg" = "yes"; then
        AC_DEFINE(BDEBUG,1,[Enable optimizer debugging])
fi
AC_MSG_RESULT(${enable_optimizer_dbg-no})

AC_MSG_CHECKING(whether to build parser debugging code)
AC_ARG_ENABLE(yydebug,
AC_HELP_STRING([--enable-yydebug],[build parser debugging code]))
if test "$enable_yydebug" = "yes"; then
        AC_DEFINE(YYDEBUG,1,[Enable parser debugging])
fi
AC_MSG_RESULT(${enable_yydebug-no})

#
# Look for {f}lex.
#
AC_PROG_LEX
if test "$LEX" = ":"; then
        AC_MSG_ERROR([Neither flex nor lex was found.])
fi

#
# Make sure {f}lex supports the -P, --header-file, and --nounput flags
# and supports processing our scanner.l.
#
AC_CACHE_CHECK([for capable lex], tcpdump_cv_capable_lex,
        if $LEX -P pcap_ --header-file=/dev/null --nounput -t $srcdir/scanner.l > /dev/null 2>&1; then
            tcpdump_cv_capable_lex=yes
        else
            tcpdump_cv_capable_lex=insufficient
        fi)
if test $tcpdump_cv_capable_lex = insufficient ; then
        AC_MSG_ERROR([$LEX is insufficient to compile libpcap.
 libpcap requires Flex 2.5.31 or later, or a compatible version of lex.])
fi

#
# Look for yacc/bison/byacc.
#
AC_PROG_YACC

#
# Make sure it supports the -p flag and supports processing our
# grammar.y.
#
AC_CACHE_CHECK([for capable yacc/bison], tcpdump_cv_capable_yacc,
        if $YACC -p pcap_ -o /dev/null $srcdir/grammar.y >/dev/null 2>&1; then
            tcpdump_cv_capable_yacc=yes
        else
            tcpdump_cv_capable_yacc=insufficient
        fi)
if test $tcpdump_cv_capable_yacc = insufficient ; then
        AC_MSG_ERROR([$YACC is insufficient to compile libpcap.
 libpcap requires Bison, Berkeley YACC, or another YACC compatible with them.])
fi

#
# Do various checks for various OSes and versions of those OSes.
#
# Assume, by default, no support for shared libraries and V7/BSD
# convention for man pages (file formats in section 5, miscellaneous
# info in section 7, administrative commands and daemons in section 8).
# Individual cases can override this.
#
DYEXT="none"
MAN_FILE_FORMATS=5
MAN_MISC_INFO=7
MAN_ADMIN_COMMANDS=8
case "$host_os" in

aix*)
        dnl Workaround to enable certain features
        AC_DEFINE(_SUN,1,[define on AIX to get certain functions])

        #
        # AIX makes it fun to build shared and static libraries,
        # because they're *both* ".a" archive libraries.  We
        # build the static library for the benefit of the traditional
        # scheme of building libpcap and tcpdump in subdirectories of
        # the same directory, with tcpdump statically linked with the
        # libpcap in question, but we also build a shared library as
        # "libpcap.shareda" and install *it*, rather than the static
        # library, as "libpcap.a".
        #
        DYEXT="shareda"

        case "$V_PCAP" in

        dlpi)
                #
                # If we're using DLPI, applications will need to
                # use /lib/pse.exp if present, as we use the
                # STREAMS routines.
                #
                pseexe="/lib/pse.exp"
                AC_MSG_CHECKING(for $pseexe)
                if test -f $pseexe ; then
                        AC_MSG_RESULT(yes)
                        LIBS="-I:$pseexe"
                fi
                ;;

        bpf)
                #
                # If we're using BPF, we need "-lodm" and "-lcfg", as
                # we use them to load the BPF module.
                #
                LIBS="-lodm -lcfg"
                ;;
        esac
        ;;

darwin*)
        DYEXT="dylib"
        V_CCOPT="$V_CCOPT -fno-common"
        AC_ARG_ENABLE(universal,
        AC_HELP_STRING([--disable-universal],[don't build universal on macOS]))
        if test "$enable_universal" != "no"; then
                case "$host_os" in

                darwin[0-7].*)
                        #
                        # Pre-Tiger.  Build only for 32-bit PowerPC; no
                        # need for any special compiler or linker flags.
                        #
                        ;;

                darwin8.[0123]*)
                        #
                        # Tiger, prior to Intel support.  Build for 32-bit
                        # PowerPC and 64-bit PowerPC, with 32-bit PowerPC
                        # first.  (I'm guessing that's what Apple does.)
                        #
                        V_CCOPT="$V_CCOPT -arch ppc -arch ppc64"
                        LDFLAGS="$LDFLAGS -arch ppc -arch ppc64"
                        ;;

                darwin8.[456]*)
                        #
                        # Tiger, subsequent to Intel support but prior to
                        # x86-64 support.  Build for 32-bit PowerPC, 64-bit
                        # PowerPC, and x86, with 32-bit PowerPC first.
                        # (I'm guessing that's what Apple does.)
                        #
                        V_CCOPT="$V_CCOPT -arch ppc -arch ppc64 -arch i386"
                        LDFLAGS="$LDFLAGS -arch ppc -arch ppc64 -arch i386"
                        ;;

                darwin8.*)
                        #
                        # All other Tiger, so subsequent to x86-64
                        # support. Build for 32-bit PowerPC, 64-bit
                        # PowerPC, x86, and x86-64, and with 32-bit PowerPC
                        # first.  (I'm guessing that's what Apple does.)
                        #
                        V_CCOPT="$V_CCOPT -arch ppc -arch ppc64 -arch i386 -arch x86_64"
                        LDFLAGS="$LDFLAGS -arch ppc -arch ppc64 -arch i386 -arch x86_64"
                        ;;

                darwin9.*)
                        #
                        # Leopard.  Build for 32-bit PowerPC, 64-bit
                        # PowerPC, x86, and x86-64, with 32-bit PowerPC
                        # first.  (That's what Apple does.)
                        #
                        V_CCOPT="$V_CCOPT -arch ppc -arch ppc64 -arch i386 -arch x86_64"
                        LDFLAGS="$LDFLAGS -arch ppc -arch ppc64 -arch i386 -arch x86_64"
                        ;;

                darwin10.*)
                        #
                        # Snow Leopard.  Build for x86-64, x86, and
                        # 32-bit PowerPC, with x86-64 first.  (That's
                        # what Apple does, even though Snow Leopard
                        # doesn't run on PPC, so PPC libpcap runs under
                        # Rosetta, and Rosetta doesn't support BPF
                        # ioctls, so PPC programs can't do live
                        # captures.)
                        #
                        V_CCOPT="$V_CCOPT -arch x86_64 -arch i386 -arch ppc"
                        LDFLAGS="$LDFLAGS -arch x86_64 -arch i386 -arch ppc"
                        ;;

                darwin*)
                        #
                        # Post-Snow Leopard.  Build for x86-64 and
                        # x86, with x86-64 first.  (That's probably what
                        # Apple does, given that Rosetta is gone.)
                        # XXX - update if and when Apple drops support
                        # for 32-bit x86 code.
                        #
                        V_CCOPT="$V_CCOPT -arch x86_64 -arch i386"
                        LDFLAGS="$LDFLAGS -arch x86_64 -arch i386"
                        ;;
                esac
        fi
        ;;

hpux9*)
        AC_DEFINE(HAVE_HPUX9,1,[on HP-UX 9.x])

        #
        # Use System V conventions for man pages.
        #
        MAN_ADMIN_COMMANDS=1m
        MAN_FILE_FORMATS=4
        MAN_MISC_INFO=5
        ;;

hpux10.0*)

        #
        # Use System V conventions for man pages.
        #
        MAN_ADMIN_COMMANDS=1m
        MAN_FILE_FORMATS=4
        MAN_MISC_INFO=5
        ;;

hpux10.1*)

        #
        # Use System V conventions for man pages.
        #
        MAN_ADMIN_COMMANDS=1m
        MAN_FILE_FORMATS=4
        MAN_MISC_INFO=5
        ;;

hpux*)
        dnl HPUX 10.20 and above is similar to HPUX 9, but
        dnl not the same....
        dnl
        dnl XXX - DYEXT should be set to "sl" if this is building
        dnl for 32-bit PA-RISC, but should be left as "so" for
        dnl 64-bit PA-RISC or, I suspect, IA-64.
        AC_DEFINE(HAVE_HPUX10_20_OR_LATER,1,[on HP-UX 10.20 or later])
        if test "`uname -m`" = "ia64"; then
                DYEXT="so"
        else
                DYEXT="sl"
        fi

        #
        # "-b" builds a shared library; "+h" sets the soname.
        #
        SHLIB_OPT="-b"
        SONAME_OPT="+h"

        #
        # Use System V conventions for man pages.
        #
        MAN_FILE_FORMATS=4
        MAN_MISC_INFO=5
        ;;

irix*)
        #
        # Use IRIX conventions for man pages; they're the same as the
        # System V conventions, except that they use section 8 for
        # administrative commands and daemons.
        #
        MAN_FILE_FORMATS=4
        MAN_MISC_INFO=5
        ;;

linux*|freebsd*|netbsd*|openbsd*|dragonfly*|kfreebsd*|gnu*)
        DYEXT="so"

        #
        # Compiler assumed to be GCC; run-time linker may require a -R
        # flag.
        #
        if test "$libdir" != "/usr/lib"; then
                V_RFLAGS=-Wl,-R$libdir
        fi
        ;;

osf*)
        DYEXT="so"

        #
        # DEC OSF/1, a/k/a Digial UNIX, a/k/a Tru64 UNIX.
        # Use Tru64 UNIX conventions for man pages; they're the same as
        # the System V conventions except that they use section 8 for
        # administrative commands and daemons.
        #
        MAN_FILE_FORMATS=4
        MAN_MISC_INFO=5
        ;;

sinix*)
        AC_MSG_CHECKING(if SINIX compiler defines sinix)
        AC_CACHE_VAL(ac_cv_cc_sinix_defined,
                AC_TRY_COMPILE(
                    [],
                    [int i = sinix;],
                    ac_cv_cc_sinix_defined=yes,
                    ac_cv_cc_sinix_defined=no))
            AC_MSG_RESULT($ac_cv_cc_sinix_defined)
            if test $ac_cv_cc_sinix_defined = no ; then
                    AC_DEFINE(sinix,1,[on sinix])
            fi
        ;;

solaris*)
        AC_DEFINE(HAVE_SOLARIS,1,[On solaris])

        DYEXT="so"

        #
        # Make sure errno is thread-safe, in case we're called in
        # a multithreaded program.  We don't guarantee that two
        # threads can use the *same* pcap_t safely, but the
        # current version does guarantee that you can use different
        # pcap_t's in different threads, and even that pcap_compile()
        # is thread-safe (it wasn't thread-safe in some older versions).
        #
        V_CCOPT="$V_CCOPT -D_TS_ERRNO"

        case "`uname -r`" in

        5.12)
                ;;

        *)
                #
                # Use System V conventions for man pages.
                #
                MAN_ADMIN_COMMANDS=1m
                MAN_FILE_FORMATS=4
                MAN_MISC_INFO=5
        esac
        ;;
esac

AC_ARG_ENABLE(shared,
AC_HELP_STRING([--enable-shared],[build shared libraries @<:@default=yes, if support available@:>@]))
test "x$enable_shared" = "xno" && DYEXT="none"

AC_PROG_RANLIB
AC_CHECK_TOOL([AR], [ar])

AC_PROG_LN_S
AC_SUBST(LN_S)

AC_LBL_DEVEL(V_CCOPT)

#
# Check to see if the sockaddr struct has the 4.4 BSD sa_len member.
#
AC_CHECK_MEMBERS([struct sockaddr.sa_len],,,
    [
        #include <sys/types.h>
        #include <sys/socket.h>
    ])

#
# Check to see if there's a sockaddr_storage structure.
#
AC_CHECK_TYPES(struct sockaddr_storage,,,
    [
        #include <sys/types.h>
        #include <sys/socket.h>
    ])

#
# Check to see if the dl_hp_ppa_info_t struct has the HP-UX 11.00
# dl_module_id_1 member.
#
# NOTE: any failure means we conclude that it doesn't have that member,
# so if we don't have DLPI, don't have a <sys/dlpi_ext.h> header, or
# have one that doesn't declare a dl_hp_ppa_info_t type, we conclude
# it doesn't have that member (which is OK, as either we won't be
# using code that would use that member, or we wouldn't compile in
# any case).
#
AC_CHECK_MEMBERS([dl_hp_ppa_info_t.dl_module_id_1],,,
    [
        #include <sys/types.h>
        #include <sys/dlpi.h>
        #include <sys/dlpi_ext.h>
    ])

AC_LBL_UNALIGNED_ACCESS

AC_SUBST(V_CCOPT)
AC_SUBST(V_DEFS)
AC_SUBST(V_FINDALLDEVS)
AC_SUBST(V_INCLS)
AC_SUBST(V_LEX)
AC_SUBST(V_PCAP)
AC_SUBST(V_SHLIB_CCOPT)
AC_SUBST(V_SHLIB_CMD)
AC_SUBST(V_SHLIB_OPT)
AC_SUBST(V_SONAME_OPT)
AC_SUBST(V_RPATH_OPT)
AC_SUBST(V_YACC)
AC_SUBST(ADDLOBJS)
AC_SUBST(ADDLARCHIVEOBJS)
AC_SUBST(SSRC)
AC_SUBST(DYEXT)
AC_SUBST(MAN_FILE_FORMATS)
AC_SUBST(MAN_MISC_INFO)
AC_SUBST(MAN_ADMIN_COMMANDS)
AC_SUBST(PTHREAD_LIBS)
AC_SUBST(BUILD_RPCAPD)
AC_SUBST(INSTALL_RPCAPD)
AC_SUBST(RPCAPD_LIBS)
AC_SUBST(EXTRA_NETWORK_LIBS)

AC_ARG_ENABLE([usb],
[AC_HELP_STRING([--enable-usb],[enable USB capture support @<:@default=yes, if support available@:>@])],
    [],
    [enable_usb=yes])

if test "xxx_only" = yes; then
        # User requested something-else-only pcap, so they don't
        # want USB support.
        enable_usb=no
fi

if test "x$enable_usb" != "xno" ; then
   dnl check for USB sniffing support
   AC_MSG_CHECKING(for USB sniffing support)
   case "$host_os" in
   linux*)
        AC_DEFINE(PCAP_SUPPORT_USB, 1, [target host supports USB sniffing])
        USB_SRC=pcap-usb-linux.c
        AC_MSG_RESULT(yes)
        ac_usb_dev_name=`udevinfo -q name -p /sys/class/usb_device/usbmon 2>/dev/null`
        if test $? -ne 0 ; then
          ac_usb_dev_name="usbmon"
        fi
        AC_DEFINE_UNQUOTED(LINUX_USB_MON_DEV, "/dev/$ac_usb_dev_name", [path for device for USB sniffing])
        AC_MSG_NOTICE(Device for USB sniffing is /dev/$ac_usb_dev_name)
        #
        # Do we have a version of <linux/compiler.h> available?
        # If so, we might need it for <linux/usbdevice_fs.h>.
        #
        AC_CHECK_HEADERS(linux/compiler.h)
        if test "$ac_cv_header_linux_compiler_h" = yes; then
          #
          # Yes - include it when testing for <linux/usbdevice_fs.h>.
          #
          AC_CHECK_HEADERS(linux/usbdevice_fs.h,,,[#include <linux/compiler.h>])
        else
          AC_CHECK_HEADERS(linux/usbdevice_fs.h)
        fi
        if test "$ac_cv_header_linux_usbdevice_fs_h" = yes; then
          #
          # OK, does it define bRequestType?  Older versions of the kernel
          # define fields with names like "requesttype, "request", and
          # "value", rather than "bRequestType", "bRequest", and
          # "wValue".
          #
          AC_CHECK_MEMBERS([struct usbdevfs_ctrltransfer.bRequestType],,,
              [
                  AC_INCLUDES_DEFAULT
                  #ifdef HAVE_LINUX_COMPILER_H
                  #include <linux/compiler.h>
                  #endif
                  #include <linux/usbdevice_fs.h>
              ])
        fi
        ;;
    freebsd*)
        #
        # This just uses BPF in FreeBSD 8.4 and later; we don't need
        # to check for anything special for capturing.
        #
        AC_MSG_RESULT([yes, in FreeBSD 8.4 and later])
        ;;

    *)
        AC_MSG_RESULT(no)
        ;;
esac
fi
AC_SUBST(PCAP_SUPPORT_USB)
AC_SUBST(USB_SRC)

dnl check for netfilter sniffing support
if test "xxx_only" != yes; then
        AC_MSG_CHECKING(whether the platform could support netfilter sniffing)
        case "$host_os" in
        linux*)
                AC_MSG_RESULT(yes)
                #
                # Life's too short to deal with trying to get this to compile
                # if you don't get the right types defined with
                # __KERNEL_STRICT_NAMES getting defined by some other include.
                #
                # Check whether the includes Just Work.  If not, don't turn on
                # netfilter support.
                #
                AC_MSG_CHECKING(whether we can compile the netfilter support)
                AC_CACHE_VAL(ac_cv_netfilter_can_compile,
                  AC_TRY_COMPILE([
AC_INCLUDES_DEFAULT
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/types.h>

#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_log.h>
#include <linux/netfilter/nfnetlink_queue.h>],
                    [],
                    ac_cv_netfilter_can_compile=yes,
                    ac_cv_netfilter_can_compile=no))
                AC_MSG_RESULT($ac_cv_netfilter_can_compile)
                if test $ac_cv_netfilter_can_compile = yes ; then
                  AC_DEFINE(PCAP_SUPPORT_NETFILTER, 1,
                    [target host supports netfilter sniffing])
                  NETFILTER_SRC=pcap-netfilter-linux.c
                fi
                ;;
        *)
                AC_MSG_RESULT(no)
                ;;
        esac
fi
AC_SUBST(PCAP_SUPPORT_NETFILTER)
AC_SUBST(NETFILTER_SRC)

AC_ARG_ENABLE([netmap],
[AC_HELP_STRING([--enable-netmap],[enable netmap support @<:@default=yes, if support available@:>@])],
    [],
    [enable_netmap=yes])

if test "x$enable_netmap" != "xno" ; then
        #
        # Check whether net/netmap_user.h is usable if NETMAP_WITH_LIBS is
        # defined; it's not usable on DragonFly BSD 4.6 if NETMAP_WITH_LIBS
        # is defined, for example, as it includes a non-existent malloc.h
        # header.
        #
        AC_MSG_CHECKING(whether we can compile the netmap support)
        AC_CACHE_VAL(ac_cv_net_netmap_user_can_compile,
          AC_TRY_COMPILE([
AC_INCLUDES_DEFAULT
#define NETMAP_WITH_LIBS
#include <net/netmap_user.h>],
            [],
            ac_cv_net_netmap_user_can_compile=yes,
            ac_cv_net_netmap_user_can_compile=no))
        AC_MSG_RESULT($ac_cv_net_netmap_user_can_compile)
        if test $ac_cv_net_netmap_user_can_compile = yes ; then
          AC_DEFINE(PCAP_SUPPORT_NETMAP, 1,
            [target host supports netmap])
            NETMAP_SRC=pcap-netmap.c
        fi
        AC_SUBST(PCAP_SUPPORT_NETMAP)
        AC_SUBST(NETMAP_SRC)
fi


AC_ARG_ENABLE([bluetooth],
[AC_HELP_STRING([--enable-bluetooth],[enable Bluetooth support @<:@default=yes, if support available@:>@])],
    [],
    [enable_bluetooth=ifsupportavailable])

if test "xxx_only" = yes; then
        # User requested something-else-only pcap, so they don't
        # want Bluetooth support.
        enable_bluetooth=no
fi

if test "x$enable_bluetooth" != "xno" ; then
        dnl check for Bluetooth sniffing support
        case "$host_os" in
        linux*)
                AC_CHECK_HEADER(bluetooth/bluetooth.h,
                    [
                        #
                        # We have bluetooth.h, so we support Bluetooth
                        # sniffing.
                        #
                        AC_DEFINE(PCAP_SUPPORT_BT, 1, [target host supports Bluetooth sniffing])
                        BT_SRC=pcap-bt-linux.c
                        AC_MSG_NOTICE(Bluetooth sniffing is supported)
                        ac_lbl_bluetooth_available=yes

                        #
                        # OK, does struct sockaddr_hci have an hci_channel
                        # member?
                        #
                        AC_CHECK_MEMBERS([struct sockaddr_hci.hci_channel],
                            [
                                #
                                # Yes; is HCI_CHANNEL_MONITOR defined?
                                #
                                AC_MSG_CHECKING(if HCI_CHANNEL_MONITOR is defined)
                                AC_CACHE_VAL(ac_cv_lbl_hci_channel_monitor_is_defined,
                                    AC_TRY_COMPILE(
                                        [
                                            #include <bluetooth/bluetooth.h>
                                            #include <bluetooth/hci.h>
                                        ],
                                        [
                                            u_int i = HCI_CHANNEL_MONITOR;
                                        ],
                                        [
                                            AC_MSG_RESULT(yes)
                                            AC_DEFINE(PCAP_SUPPORT_BT_MONITOR,,
                                              [target host supports Bluetooth Monitor])
                                            BT_MONITOR_SRC=pcap-bt-monitor-linux.c
                                        ],
                                        [
                                            AC_MSG_RESULT(no)
                                        ]))
                            ],,
                            [
                                #include <bluetooth/bluetooth.h>
                                #include <bluetooth/hci.h>
                            ])
                    ],
                    [
                        #
                        # We don't have bluetooth.h, so we don't support
                        # Bluetooth sniffing.
                        #
                        if test "x$enable_bluetooth" = "xyes" ; then
                                AC_MSG_ERROR(Bluetooth sniffing is not supported; install bluez-lib devel to enable it)
                        else
                                AC_MSG_NOTICE(Bluetooth sniffing is not supported; install bluez-lib devel to enable it)
                        fi
                    ])
                ;;
        *)
                if test "x$enable_bluetooth" = "xyes" ; then
                        AC_MSG_ERROR(no Bluetooth sniffing support implemented for $host_os)
                else
                        AC_MSG_NOTICE(no Bluetooth sniffing support implemented for $host_os)
                fi
                ;;
        esac
        AC_SUBST(PCAP_SUPPORT_BT)
        AC_SUBST(BT_SRC)
        AC_SUBST(BT_MONITOR_SRC)
fi

AC_ARG_ENABLE([dbus],
[AC_HELP_STRING([--enable-dbus],[enable D-Bus capture support @<:@default=yes, if support available@:>@])],
    [],
    [enable_dbus=ifavailable])

if test "xxx_only" = yes; then
        # User requested something-else-only pcap, so they don't
        # want D-Bus support.
        enable_dbus=no
fi

if test "x$enable_dbus" != "xno"; then
        if test "x$enable_dbus" = "xyes"; then
                case "$host_os" in

                darwin*)
                        #
                        # We don't support D-Bus sniffing on macOS; see
                        #
                        # https://bugs.freedesktop.org/show_bug.cgi?id=74029
                        #
                        # The user requested it, so fail.
                        #
                        AC_MSG_ERROR([Due to freedesktop.org bug 74029, D-Bus capture support is not available on macOS])
                esac
        else
                case "$host_os" in

                darwin*)
                        #
                        # We don't support D-Bus sniffing on macOS; see
                        #
                        # https://bugs.freedesktop.org/show_bug.cgi?id=74029
                        #
                        # The user dind't explicitly request it, so just
                        # silently refuse to enable it.
                        #
                        enable_dbus="no"
                        ;;
                esac
        fi
fi

if test "x$enable_dbus" != "xno"; then
        AC_CHECK_PROG([PKGCONFIG], [pkg-config], [pkg-config], [no])
        if test "x$PKGCONFIG" != "xno"; then
                AC_MSG_CHECKING([for D-Bus])
                if "$PKGCONFIG" dbus-1; then
                        AC_MSG_RESULT([yes])
                        DBUS_CFLAGS=`"$PKGCONFIG" --cflags dbus-1`
                        DBUS_LIBS=`"$PKGCONFIG" --libs dbus-1`
                        save_CFLAGS="$CFLAGS"
                        save_LIBS="$LIBS"
                        CFLAGS="$CFLAGS $DBUS_CFLAGS"
                        LIBS="$LIBS $DBUS_LIBS"
                        AC_MSG_CHECKING(whether the D-Bus library defines dbus_connection_read_write)
                        AC_TRY_LINK(
                            [#include <string.h>

                             #include <time.h>
                             #include <sys/time.h>

                             #include <dbus/dbus.h>],
                            [return dbus_connection_read_write(NULL, 0);],
                            [
                                AC_MSG_RESULT([yes])
                                AC_DEFINE(PCAP_SUPPORT_DBUS, 1, [support D-Bus sniffing])
                                DBUS_SRC=pcap-dbus.c
                                V_INCLS="$V_INCLS $DBUS_CFLAGS"
                            ],
                            [
                                AC_MSG_RESULT([no])
                                if test "x$enable_dbus" = "xyes"; then
                                    AC_MSG_ERROR([--enable-dbus was given, but the D-Bus library doesn't define dbus_connection_read_write()])
                                fi
                                LIBS="$save_LIBS"
                             ])
                        CFLAGS="$save_CFLAGS"
                else
                        AC_MSG_RESULT([no])
                        if test "x$enable_dbus" = "xyes"; then
                                AC_MSG_ERROR([--enable-dbus was given, but the dbus-1 package is not installed])
                        fi
                fi
        fi
        AC_SUBST(PCAP_SUPPORT_DBUS)
        AC_SUBST(DBUS_SRC)
fi

AC_ARG_ENABLE([rdma],
[AC_HELP_STRING([--enable-rdma],[enable RDMA capture support @<:@default=yes, if support available@:>@])],
    [],
    [enable_rdmasniff=ifavailable])

if test "xxx_only" = yes; then
        # User requested something-else-only pcap, so they don't
        # want RDMA support.
        enable_rdmasniff=no
fi

if test "x$enable_rdmasniff" != "xno"; then
        AC_CHECK_LIB(ibverbs, ibv_get_device_list, [
                AC_CHECK_HEADER(infiniband/verbs.h, [
                        #
                        # ibv_create_flow may be defined as a static inline
                        # function in infiniband/verbs.h, so we can't
                        # use AC_CHECK_LIB.
                        #
                        # Too bad autoconf has no AC_SYMBOL_EXISTS()
                        # macro that works like CMake's check_symbol_exists()
                        # function, to check do a compile check like
                        # this (they do a clever trick to avoid having
                        # to know the function's signature).
                        #
                        AC_MSG_CHECKING(whether libibverbs defines ibv_create_flow)
                        AC_TRY_LINK(
                                [
                                        #include <infiniband/verbs.h>
                                ],
                                [
                                        (void) ibv_create_flow((struct ibv_qp *) NULL,
                                                               (struct ibv_flow_attr *) NULL);
                                ],
                                [
                                        AC_MSG_RESULT([yes])
                                        AC_DEFINE(PCAP_SUPPORT_RDMASNIFF, , [target host supports RDMA sniffing])
                                        RDMA_SRC=pcap-rdmasniff.c
                                        LIBS="-libverbs $LIBS"
                                ],
                                [
                                        AC_MSG_RESULT([no])
                                ]
                        )
                ])
        ])
        AC_SUBST(PCAP_SUPPORT_RDMASNIFF)
        AC_SUBST(RDMA_SRC)
fi

AC_PROG_INSTALL

AC_CONFIG_HEADER(config.h)

AC_OUTPUT_COMMANDS([if test -f .devel; then
        echo timestamp > stamp-h
        cat $srcdir/Makefile-devel-adds >> Makefile
        make depend
fi])
AC_OUTPUT(Makefile pcap-filter.manmisc pcap-linktype.manmisc
        pcap-tstamp.manmisc pcap-savefile.manfile pcap.3pcap
        pcap_compile.3pcap pcap_datalink.3pcap pcap_dump_open.3pcap
        pcap_get_tstamp_precision.3pcap pcap_list_datalinks.3pcap
        pcap_list_tstamp_types.3pcap pcap_open_dead.3pcap
        pcap_open_offline.3pcap pcap_set_tstamp_precision.3pcap
        pcap_set_tstamp_type.3pcap rpcapd/Makefile rpcapd/rpcapd.manadmin
        testprogs/Makefile)
exit 0