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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: