Hello

I am using this package with my project.
I met error bellows

Skipping XML Document “/opt/ros/indigo/share/gmapping/nodelet_plugins.xml” which had no Root Element. This likely means the XML is malformed or missing.

After I had manually copied 'nodelet_plugins.xml' file from here, then this error was disappeared.

I don't know root cause exactly, but I guess something is missed on CMakeLists.xml.

Thanks.