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-rw-r--r--posix/unistd.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 2fbdae5..0147594 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -40,6 +40,9 @@ __BEGIN_DECLS
/* POSIX Standard approved as ISO/IEC 9945-2 as of December, 1993. */
#define _POSIX2_C_VERSION 199209L
+/* The utilities on GNU systems also correspond to this version. */
+#define _POSIX2_VERSION 199209L
+
/* If defined, the implementation supports the
C Language Bindings Option. */
#define _POSIX2_C_BIND 1
@@ -56,8 +59,12 @@ __BEGIN_DECLS
creation of locales with the localedef utility. */
#define _POSIX2_LOCALEDEF 1
-/* Library conforms to X/Open version 4. */
-#define _XOPEN_VERSION 4
+/* X/Open version number to which the library conforms. It is selectable. */
+#ifdef __USE_UNIX98
+# define _XOPEN_VERSION 500
+#else
+# define _XOPEN_VERSION 4
+#endif
/* Commands and utilities from XPG4 are available. */
#define _XOPEN_XCU_VERSION 4