[PATCH 3/3] configure.ac: add AC_LANG_SOURCE to AC_COMPILE_IFELSE

[Alexander Huemer]

This is required since autoconf 2.66 for safetly reason
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index b5b9481..5e553e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,7 @@ AC_CHECK_HEADERS(execinfo.h sys/select.h)
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -fvisibility=hidden "
 AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
-AC_COMPILE_IFELSE([char foo;],
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],
       [ AC_MSG_RESULT([yes])
         SYMBOL_VISIBILITY="-fvisibility=hidden"],
         AC_MSG_RESULT([no]))
-- 
1.8.0