$OpenBSD: patch-m4_ac_attribute_m4,v 1.1 2017/09/28 15:08:54 dcoppa Exp $

Index: m4/ac_attribute.m4
--- m4/ac_attribute.m4.orig
+++ m4/ac_attribute.m4
@@ -16,8 +16,9 @@ AC_DEFUN([AC_C___ATTRIBUTE__],
 [
   AC_MSG_CHECKING(for __attribute__)
   AC_CACHE_VAL(ac_cv___attribute__, [
-  AC_TRY_COMPILE([#include <stdlib.h>],
-  [int func(int x); int foo(int x __attribute__ ((unused))) { exit(1); }],
+  AC_TRY_COMPILE([#include <stdlib.h>
+  int func(int x); int foo(int x __attribute__ ((unused))) { exit(1); }],
+  [],
   ac_cv___attribute__=yes, ac_cv___attribute__=no)])
   if test "$ac_cv___attribute__" = "yes"; then
     AC_DEFINE(HAVE___ATTRIBUTE__, 1, [Define to 1 if your compiler has __attribute__])
