$NetBSD: patch-src_Makefile,v 1.1 2025/10/17 22:07:48 mrg Exp $

--- unix/unix.mak.orig	2025-09-27 22:03:33.206737661 -0700
+++ unix/unix.mak	2025-09-27 22:05:31.100813679 -0700
@@ -109,7 +109,7 @@
 
 regexp.o: $(BUILDERS) config.h
 	cd ./regexp; \
-	    $(MAKE) CC='$(CC)' CFLAGS='-O' O=o regexp.o >err 2>&1 || \
+	    $(MAKE) CC='$(CC)' CFLAGS='$(CFLAGS)' O=o regexp.o >err 2>&1 || \
 	    { cat err; rm err; exit 1; }
 	rm regexp/err
 	mv regexp/regexp.o .