diff --git a/lib/libfetch/Makefile b/lib/libfetch/Makefile
index bcd521409dd2..84eb6e4435fb 100644
--- a/lib/libfetch/Makefile
+++ b/lib/libfetch/Makefile
@@ -4,13 +4,16 @@
 
 LIB=		fetch
 CFLAGS+=	-I.
-CFLAGS+=	-DINET6
 SRCS=		fetch.c common.c ftp.c http.c file.c \
 		ftperr.h httperr.h
 INCS=		fetch.h
 MAN=		fetch.3
 CLEANFILES=	ftperr.h httperr.h
 
+.if ${MK_INET6_SUPPORT} != "no"
+CFLAGS+=	-DINET6
+.endif
+
 .if ${MK_OPENSSL} != "no"
 CFLAGS+=	-DWITH_SSL
 DPADD=		${LIBSSL} ${LIBCRYPTO}
diff --git a/lib/libftpio/Makefile b/lib/libftpio/Makefile
index b803db8519b8..17b412c0c1b7 100644
--- a/lib/libftpio/Makefile
+++ b/lib/libftpio/Makefile
@@ -1,15 +1,20 @@
 # $FreeBSD$
 
+.include <bsd.own.mk>
+
 LIB=		ftpio
 SHLIB_MAJOR=	6
 
 SRCS=		ftpio.c ftperr.c
 INCS=		ftpio.h
 CFLAGS+=	-I${.CURDIR} -Wall
-CFLAGS+=	-DINET6
 MAN=		ftpio.3
 CLEANFILES=	ftperr.c
 
+.if ${MK_INET6_SUPPORT} != "no"
+CFLAGS+=	-DINET6
+.endif
+
 ftperr.c:	ftp.errors
 	@echo '#include <stdio.h>' > ${.TARGET}
 	@echo '#include "ftpio.h"' >> ${.TARGET}