kmscon: add systemd build option (on by default).

srcpkgs/kmscon/template

@@ -1,13 +1,13 @@
 # Template file for 'kmscon'
 pkgname=kmscon
 version=8
-revision=2
+revision=3
 lib32disabled=yes
 build_style=gnu-configure
-configure_args="--enable-multi-seat --disable-static"
+configure_args="--disable-static"
 hostmakedepends="pkg-config docbook-xsl xkeyboard-config"
 makedepends="MesaLib-devel pango-devel libtsm-devel libxkbcommon-devel
- libpciaccess-devel libudev-devel systemd-devel dbus-devel fuse-devel"
+ libpciaccess-devel libudev-devel dbus-devel fuse-devel"
 depends="xkeyboard-config"
 short_desc="Terminal emulator based on Kernel Mode Setting (KMS)"
 maintainer="Juan RP <xtraeme@gmail.com>"
@@ -16,6 +16,18 @@ homepage="http://www.freedesktop.org/wiki/Software/kmscon"
 distfiles="http://freedesktop.org/software/kmscon/releases/kmscon-8.tar.xz"
 checksum=0ab01c1cdc4fbd692ce765e80478bc2d9663a7c55a5c75cc7ac421366ee6ae2b
 
+# Package build options
+build_options="systemd"
+build_options_default="systemd"
+desc_option_systemd="Enable support for systemd"
+
+if [ "$build_option_systemd" ]; then
+	configure_args+=" --enable-multi-seat"
+	makedepends+=" systemd-devel"
+else
+	configure_args+=" --disable-multi-seat"
+fi
+
 post_install() {
 	vinstall COPYING 644 usr/share/licenses/${pkgname}
 	vmkdir usr/lib/systemd/system