liblogging: add systemd build option (disabled by default).

srcpkgs/liblogging/template

@@ -1,11 +1,10 @@
 # Template file for 'liblogging'
 pkgname=liblogging
 version=1.0.2
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-static --enable-cached-man-pages"
 hostmakedepends="pkg-config"
-makedepends="systemd-devel"
 short_desc="Easy to use, portable, open source library for system logging"
 maintainer="Juan RP <xtraeme@gmail.com>"
 license="LGPL-2.1"
@@ -13,6 +12,17 @@ homepage="http://www.liblogging.org/"
 distfiles="http://download.rsyslog.com/liblogging/${pkgname}-${version}.tar.gz"
 checksum=1fecfdc506ee937c21c30d868c76842506dc34ea5eb168b81fd11eb9483e4388
 
+# Package build options
+build_options="systemd"
+desc_option_systemd="Enable support for systemd journal"
+
+if [ "$build_option_systemd" ]; then
+	configure_args+=" --enable-journal"
+	makedepends+=" systemd-devel"
+else
+	configure_args+=" --disable-journal"
+fi
+
 liblogging-devel_package() {
 	depends="${sourcepkg}>=${version}_${revision}"
 	short_desc+=" - development files"