--- Makefile.orig	Tue Jul 26 03:13:47 2005
+++ Makefile	Tue Jul 26 03:13:02 2005
@@ -21,8 +21,7 @@
 COMMENT=	The multi-router traffic grapher
 
 RUN_DEPENDS=	${SITE_PERL}/SNMP_Session.pm:${PORTSDIR}/net-mgmt/p5-SNMP_Session \
-		${SITE_PERL}/Pod/Usage.pm:${PORTSDIR}/textproc/p5-Pod-Parser \
-		${SITE_PERL}/IO/Socket/INET6.pm:${PORTSDIR}/net/p5-IO-INET6
+		${SITE_PERL}/Pod/Usage.pm:${PORTSDIR}/textproc/p5-Pod-Parser
 
 LIB_DEPENDS=	gd.4:${PORTSDIR}/graphics/gd
 CONFIGURE_ARGS=	--with-gd-lib=${LOCALBASE}/lib \
@@ -40,6 +39,13 @@
 		mrtg-nw-guide.1 mrtg-reference.1 mrtg-rrd.1 mrtg-squid.1 \
 		mrtg-unix-guide.1 mrtg-webserver.1 mrtg.1 mrtglib.1
 
+.include <bsd.port.pre.mk>
+
+# IPv6 support is optional -- mrtg has code to support this
+.if !defined(WITHOUT_IPV6)
+RUN_DEPENDS+=	${SITE_PERL}/IO/Socket/INET6.pm:${PORTSDIR}/net/p5-IO-INET6
+.endif
+
 post-patch:
 	${RM} ${WRKSRC}/lib/mrtg2/BER.pm ${WRKSRC}/lib/mrtg2/SNMP_*.pm
 
@@ -72,4 +78,4 @@
 	@${ECHO} "############################################################################"
 .endif
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>