===================================================================
RCS file: /cvs/mandoc/test-strcasestr.c,v
retrieving revision 1.1
retrieving revision 1.3
diff -u -p -r1.1 -r1.3
--- mandoc/test-strcasestr.c	2013/12/31 23:03:47	1.1
+++ mandoc/test-strcasestr.c	2015/10/06 18:32:20	1.3
@@ -1,3 +1,7 @@
+#if defined(__linux__) || defined(__MINT__)
+# define _GNU_SOURCE /* strcasestr() */
+#endif
+
 #include <string.h>
 
 int
@@ -5,5 +9,5 @@ main(void)
 {
 	const char *big = "BigString";
 	char *cp = strcasestr(big, "Gst");
-	return(big + 2 != cp);
+	return cp != big + 2;
 }