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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