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-rw-r--r--libobjc/thr.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/libobjc/thr.c b/libobjc/thr.c
index 27c7fe6b..988c0ff1 100644
--- a/libobjc/thr.c
+++ b/libobjc/thr.c
@@ -27,8 +27,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define _LIBOBJC
/* The line below is needed for declarations of functions such as
pthread_mutexattr_settype, without which gthr-posix.h may fail to
- compile within libobjc. */
-#define _XOPEN_SOURCE 500
+ compile within libobjc. While we only need XPG5 for this, Solaris
+ requires XPG6 for C99 and later. */
+#define _XOPEN_SOURCE 600
#include "config.h"
#include "tconfig.h"
#include "coretypes.h"