lxc: added systemd build option.

srcpkgs/lxc/template

@@ -3,7 +3,7 @@ _desc="Linux Containers"
 
 pkgname=lxc
 version=1.0.5
-revision=8
+revision=9
 build_style=gnu-configure
 configure_args="--enable-doc --enable-seccomp --disable-apparmor --with-distro=none
  --with-rootfs-path=/var/lxc/containers --with-log-path=/var/lxc/log"
@@ -16,6 +16,7 @@ license="LGPL-2.1"
 distfiles="http://linuxcontainers.org/downloads/lxc-${version}.tar.gz"
 checksum=02ac82e69a76d424e5443b9c577e84a8eaafcebf17cfd865eedee147e8ef8844
 
+build_options="systemd"
 conf_files="/etc/lxc/default.conf"
 make_dirs="
 	/var/lib/lxc 0755 root root
@@ -27,7 +28,9 @@ pre_configure() {
 	sed -e 's,docbook2x-man,docbook2man,g' -i configure
 }
 post_install() {
+	if [ "$build_option_systemd" ]; then
 		vinstall ${FILESDIR}/service 644 usr/lib/systemd/system lxc@.service
+	fi
 	vmkdir usr/share/bash-completion/completions
 	mv ${DESTDIR}/etc/bash_completion.d/* ${DESTDIR}/usr/share/bash-completion/completions/
 	# Install void lxc config/template.