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-rw-r--r--src/unistd/_XOPEN_VERSION.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/unistd/_XOPEN_VERSION.h b/src/unistd/_XOPEN_VERSION.h
new file mode 100644
index 00000000..c2b768ee
--- /dev/null
+++ b/src/unistd/_XOPEN_VERSION.h
@@ -0,0 +1,17 @@
+#include <unistd.h>
+
+#if (defined _XOPEN_SOURCE)
+#if _XOPEN_SOURCE >= 700
+#define _XOPEN_VERSION (700)
+#elif _XOPEN_SOURCE >= 600
+#define _XOPEN_VERSION (600)
+#elif _XOPEN_SOURCE >= 500
+#define _XOPEN_VERSION (500)
+#else
+#define _XOPEN_VERSION (4)
+#endif
+#endif
+
+/*
+XOPEN(4)
+*/