Index: go/include/u.h
===================================================================
--- go.orig/include/u.h
+++ go/include/u.h
@@ -38,10 +38,13 @@ extern "C" {
 #		define __MAKECONTEXT_V2_SOURCE 1
 #	endif
 #endif
+#if defined __linux__ || defined __GNU__ || defined __GLIBC__
+#define _DEFAULT_SOURCE 1
+#else
 #define _BSD_SOURCE 1
 #define _NETBSD_SOURCE 1	/* NetBSD */
-#define _DEFAULT_SOURCE 1	/* glibc > 2.19 */
 #define _SVID_SOURCE 1
+#endif
 #if !defined(__APPLE__) && !defined(__OpenBSD__)
 #	define _XOPEN_SOURCE 1000
 #	define _XOPEN_SOURCE_EXTENDED 1