* configure.in: use 4 argument form of AC_CHECK_HEADERS to force

autoconf to use compiler's result

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38660 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Dec 30 12:09:47 2012  Charlie Somerville  <charlie@charliesomerville.com>
+
+	* configure.in: use 4 argument form of AC_CHECK_HEADERS to force
+	  autoconf to use compiler's result
+
 Sun Dec 30 10:58:04 2012  Kazuki Tsujimoto  <kazuki@callcc.net>
 
 	* test/ruby/test_keyword.rb: add a test for passing hash

configure.in

@@ -1220,7 +1220,9 @@ main()
 		    LINK_SO="$LINK_SO
 $POSTLINK"
 		fi
-		AC_CHECK_HEADERS(crt_externs.h)
+		AC_CHECK_HEADERS(crt_externs.h, [], [], [
+		    #include <crt_externs.h>
+		])
 		],
 [hpux*], [	LIBS="-lm $LIBS"
 		ac_cv_c_inline=no],