[ rosmake ] ERROR when I install uvc_cam

edit

I am using indigo in Ubuntu 14.04.2. I try to install a web camera driver like this:

cd ~/catkin_ws
https://github.com/ericperko/uvc_cam
rosmake uvc_cam

errors occur no matter whether I enter the uvc_cam folder or not:

[ rosmake ] WARNING: The following args could not be parsed as stacks or packages: ['uvc_cam']
[ rosmake ] ERROR: No arguments could be parsed into valid package or stack names.

thanks.