Makefile

--- a/Makefile	Wed Apr 27 01:02:56 2016 -0700
+++ b/Makefile	Wed Apr 27 01:07:40 2016 -0700
@@ -199,6 +199,9 @@
 docker-ubuntu-xenial: contrib/docker/ubuntu-xenial
 	contrib/dockerdeb ubuntu xenial
 
+docker-ubuntu-xenial-ppa: contrib/docker/ubuntu-xenial
+	contrib/dockerdeb ubuntu xenial --source-only
+
 fedora20:
 	mkdir -p packages/fedora20
 	contrib/buildrpm