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-rw-r--r--posix/unistd.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 80a5b86998..1b52930225 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -66,6 +66,9 @@ __BEGIN_DECLS
 /* The utilities on GNU systems also correspond to this version.  */
 #define _POSIX2_VERSION	__POSIX2_THIS_VERSION
 
+/* This symbol was required until the 2001 edition of POSIX.  */
+#define	_POSIX2_C_VERSION	__POSIX2_THIS_VERSION
+
 /* If defined, the implementation supports the
    C Language Bindings Option.  */
 #define	_POSIX2_C_BIND	__POSIX2_THIS_VERSION