avahi: added systemd build option.

srcpkgs/avahi/template

@@ -1,17 +1,16 @@
 # Template file for 'avahi'
 pkgname=avahi
 version=0.6.31
-revision=16
+revision=17
 build_style=gnu-configure
 configure_args="--disable-qt3 --disable-qt4 --disable-mono --disable-monodoc
  --disable-doxygen-doc --enable-compat-libdns_sd --enable-compat-howl
  --with-xml=expat --with-avahi-user=avahi --with-avahi-group=avahi
  --with-avahi-priv-access-group=network --with-autoipd-user=avahi
  --with-autoipd-group=avahi --with-distro=none --disable-xmltoman
- --disable-dbm --with-systemdsystemunitdir=/usr/lib/systemd/system
  --disable-static ssp_cv_lib=no --disable-python --disable-pygtk
  --disable-glib --disable-gobject --disable-gtk --disable-gtk3
- --disable-introspection"
+ --disable-dbm --disable-introspection"
 short_desc="Multicast DNS Service Discovery"
 maintainer="Juan RP <xtraeme@gmail.com>"
 license="LGPL-2.1"
@@ -22,7 +21,6 @@ checksum=8372719b24e2dd75de6f59bb1315e600db4fd092805bd1201ed0cb651a2dab48
 hostmakedepends="pkg-config intltool"
 makedepends="dbus-devel libcap-devel libdaemon-devel gdbm-devel"
 depends="dbus"
-systemd_services="avahi-daemon.service on"
 conf_files="
 	/etc/avahi/services/ssh.service
 	/etc/avahi/services/sftp-ssh.service
@@ -31,6 +29,12 @@ conf_files="
 	/etc/avahi/avahi-dnsconfd.action"
 system_accounts="avahi:23"
 
+build_options="systemd"
+if [ "$build_option_systemd" ]; then
+	configure_args+=" --with-systemdsystemunitdir=/usr/lib/systemd/system"
+	systemd_services="avahi-daemon.service on"
+fi
+
 if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" libtool glib-devel"
 	pre_configure() {