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-rw-r--r--source4/build/m4/rewrite.m45
1 files changed, 5 insertions, 0 deletions
diff --git a/source4/build/m4/rewrite.m4 b/source4/build/m4/rewrite.m4
index c906af8b10..268b07b297 100644
--- a/source4/build/m4/rewrite.m4
+++ b/source4/build/m4/rewrite.m4
@@ -971,6 +971,11 @@ fi
# Check for comparison_fn_t
AC_CACHE_CHECK([for comparison_fn_t],samba_cv_HAVE_COMPARISON_FN_T,[
AC_TRY_COMPILE([
+/* Enable GNU extensions on systems that have them */
+/* as comparison_fn_t is defined under __USE_GNU on these */
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
#include <stdlib.h>
int list_find(const void *needle,
const void *base, size_t nmemb, size_t size, comparison_fn_t comp_fn)