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-rw-r--r--libc/unistd/sysconf.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libc/unistd/sysconf.c b/libc/unistd/sysconf.c
index 92fa42765..1ed2a4c0c 100644
--- a/libc/unistd/sysconf.c
+++ b/libc/unistd/sysconf.c
@@ -16,7 +16,8 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-#define _XOPEN_SOURCE
+#define _XOPEN_SOURCE 500
+#include <features.h>
#include <errno.h>
#include <limits.h>
#include <grp.h>