Index: head/share/mk/bsd.opts.mk
===================================================================
--- head/share/mk/bsd.opts.mk
+++ head/share/mk/bsd.opts.mk
@@ -101,8 +101,7 @@
     PROFILE \
     WARNS
 .if defined(NO_${var})
-# This warning may be premature...
-#.warning "NO_${var} is defined, but deprecated. Please use MK_${var}=no instead."
+.warning "NO_${var} is defined, but deprecated. Please use MK_${var}=no instead."
 MK_${var}:=no
 .endif
 .endfor