diff --git a/gnu/lib/libregex/Makefile b/gnu/lib/libregex/Makefile
index 6525bffa0b50..56b6afdc53f8 100644
--- a/gnu/lib/libregex/Makefile
+++ b/gnu/lib/libregex/Makefile
@@ -14,7 +14,7 @@ WRINCS=		gnuregex.h
 PXINCS=		posix/regex.h
 PXINCSDIR=	${INCSDIR}/posix
 
-CFLAGS+=-D_REGEX_RE_COMP -DSTDC_HEADERS
+CFLAGS+=-DHAVE_CONFIG_H -I${.CURDIR}
 
 CLEANFILES=	regex.h.patched gnuregex.c
 regex.h.patched: regex.h
diff --git a/gnu/lib/libregex/config.h b/gnu/lib/libregex/config.h
new file mode 100644
index 000000000000..bf7f0a03b867
--- /dev/null
+++ b/gnu/lib/libregex/config.h
@@ -0,0 +1,12 @@
+/* $FreeBSD$ */
+
+#define	_REGEX_RE_COMP	1
+#define	HAVE_LANGINFO_H	1
+#define	HAVE_LANGINFO_CODESET	1
+#define	HAVE_LOCALE_H	1
+#define	HAVE_WCHAR_H	1
+#define	HAVE_WCTYPE_H	1
+#define	HAVE_ISBLANK	1
+#define	HAVE_WCRTOMB	1
+#define	HAVE_MBRTOWC	1
+#define	HAVE_WCSCOLL	1