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-rw-r--r--include/features.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index dd2c5ae03..bc80fc541 100644
--- a/include/features.h
+++ b/include/features.h
@@ -52,6 +52,7 @@
#define __USE_MISC
#define __USE_POSIX
#define __USE_POSIX2
+#define __USE_XOPEN
#define _POSIX_THREAD_SAFE_FUNCTIONS