Prepare port to act as a master to an avahi-sharp slave

Approved by:	marcus on IRC

net/avahi/Makefile

@@ -7,23 +7,23 @@
 
 PORTNAME=	avahi
 PORTVERSION=	0.6.5
-PORTREVISION=	2
-CATEGORIES=	net dns
+PORTREVISION?=	2
+CATEGORIES?=	net dns
 MASTER_SITES=	http://www.avahi.org/download/
 
-MAINTAINER=	gnome@FreeBSD.org
-COMMENT=	Service discovery on a local network
+MAINTAINER?=	gnome@FreeBSD.org
+COMMENT?=	Service discovery on a local network
 
-LIB_DEPENDS=	expat.6:${PORTSDIR}/textproc/expat2 \
+LIB_DEPENDS?=	expat.6:${PORTSDIR}/textproc/expat2 \
 		daemon.2:${PORTSDIR}/devel/libdaemon \
 		dbus-1.2:${PORTSDIR}/devel/dbus \
 		gdbm.3:${PORTSDIR}/databases/gdbm
 
-USE_GNOME=	gnomehack ltverhack glib20
+USE_GNOME?=	gnomehack ltverhack glib20
 USE_GMAKE=	yes
 USE_AUTOTOOLS=	libtool:15
 INSTALLS_SHLIB=	yes
-CONFIGURE_ARGS=	--with-distro=freebsd \
+CONFIGURE_ARGS?=--with-distro=freebsd \
 		--with-dbus-system-address=unix:path=/var/run/dbus \
 		--disable-qt3 \
 		--disable-qt4 \
@@ -38,6 +38,7 @@ CONFIGURE_ENV=	CPPFLAGS="-I${LOCALBASE}/include" \
 		PTHREAD_CFLAGS="${PTHREAD_CFLAGS}" \
 		PTHREAD_LIBS="${PTHREAD_LIBS}"
 
+.if !defined(AVAHI_SLAVE)
 USE_RC_SUBR=	yes
 
 MAN1=	avahi-browse-domains.1 avahi-browse.1 avahi-publish-address.1 \
@@ -47,9 +48,11 @@ MAN5=	avahi-daemon.conf.5 avahi.service.5
 MAN8=	avahi-daemon.8 avahi-dnsconfd.8 avahi-dnsconfd.action.8
 
 OPTIONS=	GTK2 "Build a GTK+ 2 browser utility" off
+.endif
 
 .include <bsd.port.pre.mk>
 
+.if !defined(AVAHI_SLAVE)
 .if ${OSVERSION} < 500000
 IGNORE=	does not work on FreeBSD 4.X
 .endif
@@ -67,4 +70,6 @@ post-install:
 	@${SETENV} PKG_PREFIX=${PREFIX} ${SH} ${PKGINSTALL} ${PKGNAME} POST-INSTALL
 .endif
 
+.endif
+
 .include <bsd.port.post.mk>