NetBSD has ANSI C header files.

gnu/usr.bin/gawk/Makefile

@@ -1,10 +1,10 @@
-#	$NetBSD: Makefile,v 1.7 1997/10/25 10:10:49 lukem Exp $
+#	$NetBSD: Makefile,v 1.8 1998/02/04 23:04:11 thorpej Exp $
 
 PROG=		awk
 SRCS=		main.c eval.c builtin.c msg.c iop.c io.c field.c array.c \
 		node.c version.c re.c awk.c regex.c dfa.c \
 		getopt.c getopt1.c
-CPPFLAGS+=	-DGAWK
+CPPFLAGS+=	-DGAWK -DSTDC_HEADERS
 LDADD=		-lm -lgnumalloc
 DPADD=		${LIBM} ${LIBGNUMALLOC}
 CLEANFILES+=	awk.c y.tab.h