atop: added systemd build option.

srcpkgs/atop/template

@@ -2,10 +2,9 @@
 pkgname=atop
 version=2.0.2
 wrksrc=atop-${version}
-revision=1
+revision=2
 build_style=gnu-makefile
 makedepends="ncurses-devel zlib-devel"
-systemd_services="atop.service true"
 short_desc="A system and process level monitor"
 maintainer="Juan RP <xtraeme@gmail.com>"
 license="GPL-2"
@@ -13,10 +12,17 @@ homepage="http://www.atoptool.nl/"
 distfiles="http://www.atoptool.nl/download/$pkgname-$version.tar.gz"
 checksum=a620dbe0de7c7ee004949b201bed27559a8dd6cbdee651c7a3e15fc584723409
 
+build_options="systemd"
+if [ "$build_option_systemd" ]; then
+	systemd_services="atop.service true"
+fi
+
 post_install() {
 	# Remove unused stuff.
 	rm -f ${DESTDIR}/usr/bin/atop{,sar}-2.0 
 	rm -rf ${DESTDIR}/etc/{init,logrotate}.d ${DESTDIR}/var
-	# systemd service
-	vinstall atop.service 644 usr/lib/systemd/system
+	if [ "$build_option_systemd" ]; then
+		# systemd service
+		vinstall atop.service 644 usr/lib/systemd/system
+	fi
 }