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-rw-r--r--posix/unistd.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 2ac0b2f172..0fc3d7bb92 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -50,6 +50,10 @@ __BEGIN_DECLS
Software Development Utilities Option. */
#define _POSIX2_SW_DEV 1
+/* If defined, the implementation supports the
+ creation of locales with the localedef utility. */
+#define _POSIX2_LOCALEDEF 1
+
/* Get values of POSIX options: