Makefile

--- a/Makefile	Wed Apr 27 00:27:10 2016 -0700
+++ b/Makefile	Wed Apr 27 01:02:56 2016 -0700
@@ -193,6 +193,9 @@
 docker-ubuntu-wily: contrib/docker/ubuntu-wily
 	contrib/dockerdeb ubuntu wily
 
+docker-ubuntu-wily-ppa: contrib/docker/ubuntu-wily
+	contrib/dockerdeb ubuntu wily --source-only
+
 docker-ubuntu-xenial: contrib/docker/ubuntu-xenial
 	contrib/dockerdeb ubuntu xenial