--- Makefile.orig	2009-09-11 17:24:22.000000000 +0300
+++ Makefile	2011-02-21 13:38:32.000000000 +0200
@@ -22,6 +22,8 @@
 
 MAN1=		trafshow.1
 
+OPTIONS=        IPV6           "Build with IPv6 support" off
+
 .include <bsd.port.pre.mk>
 
 post-patch:
@@ -32,6 +34,10 @@
 	@${PATCH} -d ${WRKSRC} < ${FILESDIR}/extra-patch-800074+
 .endif
 
+.if defined(WITH_IPV6)
+CFLAGS+=	-DINET6
+.endif
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/trafshow ${PREFIX}/bin
 	${INSTALL_MAN} ${WRKSRC}/trafshow.1 ${PREFIX}/man/man1