gentoo/dev-lang/algol68g/files/algol68g-3.3.21-configure-implicit.patch

--- a/configure
+++ b/configure
@@ -5568,6 +5568,10 @@ else $as_nop
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <gnu/libc-version.h>
+#include <stdlib.h>
+#include <stdio.h>
+
 int
 main (void)
 {