* configure.in (DTRACE): clear this when dtrace -l fails.

  Note that current FreeBSD needs privilege to call it;
  so to use DTrace on FreeBSD, you should run configure as root.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26240 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: nurse

ChangeLog

@@ -1,3 +1,9 @@
+Tue Jan  5 02:03:34 2010  NARUSE, Yui  <[email protected]>
+
+	* configure.in (DTRACE): clear this when `dtrace -l` fails.
+	  Note that current FreeBSD needs privilege to call it;
+	  so to use DTrace on FreeBSD, you should run configure as root.
+
 Mon Jan  4 21:24:18 2010  Yuki Sonoda (Yugui)  <[email protected]>
 
 	* gc.c: added UNLIKELY to probes for optimization.

configure.in

@@ -401,6 +401,7 @@ EOF
 ])
 
 AC_CHECK_TOOL(DTRACE, dtrace)
+$DTRACE -l 1>/dev/null 2>/dev/null || DTRACE=""
 
 AC_CHECK_TOOL(DOT, dot)
 AC_CHECK_TOOL(DOXYGEN, doxygen)