LOCALE_CHARSETS is unused in locale.c.
Index: Makefile
===================================================================
RCS file: /cvs/src/usr.bin/locale/Makefile,v
retrieving revision 1.1
diff -u -p -r1.1 Makefile
--- Makefile 3 Jun 2013 14:27:50 -0000 1.1
+++ Makefile 20 Mar 2016 13:01:37 -0000
@@ -1,9 +1,5 @@
# $OpenBSD: Makefile,v 1.1 2013/06/03 14:27:50 stsp Exp $
-# for LOCALECHARSETS
-.include "${.CURDIR}/../../share/locale/ctype/Makefile.inc"
-
PROG= locale
-CFLAGS+= -DLOCALE_CHARSETS="\"${LOCALECHARSETS}\""
.include <bsd.prog.mk>
