configure: add support for cap-ng package

[tcpdump] / configure.in

diff --git a/configure.in b/configure.in
index 7c860dc0787cc38380fd7371706c97b59f5f31ab..1f10dc5e7e9e3c03d6459243d81b2a7e180118bf 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -854,7 +854,7 @@ if test $ac_cv_func_pcap_lib_version = "no" ; then
        ac_lbl_cv_pcap_version_defined=yes,
        ac_lbl_cv_pcap_version_defined=no)
     if test "$ac_lbl_cv_pcap_version_defined" = yes ; then
-       AC_MSG_RESULT(yes)
+       AC_MSG_RESULT(yes)
        AC_DEFINE(HAVE_PCAP_VERSION, 1, [define if libpcap has pcap_version])
     else
        AC_MSG_RESULT(no)
@@ -1110,6 +1110,35 @@ if test "$want_libcrypto" != "no"; then
        AC_CHECK_HEADERS(openssl/evp.h)
 fi
 
+# Check for libcap-ng
+AC_MSG_CHECKING(whether to use libcap-ng)
+# Specify location for both includes and libraries.
+want_libcap_ng=ifavailable
+AC_ARG_WITH(cap_ng,
+    AS_HELP_STRING([--with-cap-ng],
+                  [use libcap-ng @<:@default=yes, if available@:>@]),
+[
+       if test $withval = no
+       then
+               want_libcap_ng=no
+               AC_MSG_RESULT(no)
+       elif test $withval = yes
+       then
+               want_libcap_ng=yes
+               AC_MSG_RESULT(yes)
+       fi
+],[
+       #
+       # Use libcap-ng if it's present, otherwise don't.
+       #
+       want_libcap_ng=ifavailable
+       AC_MSG_RESULT([yes, if available])
+])
+if test "$want_libcap_ng" != "no"; then
+       AC_CHECK_LIB(cap-ng, capng_change_id)
+       AC_CHECK_HEADERS(cap-ng.h)
+fi
+
 dnl
 dnl set additional include path if necessary
 if test "$missing_includes" = "yes"; then