How I can compile ros_comm from modified source code?

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I want to compile ros_comm package from modified source code from link text, how I can to this? This link(link text) told us how to build ROS from source code, but I am confused when it comes to download source code from my github branch. The original command should be

$ rosinstall_generator ros_comm --rosdistro kinetic --deps --wet-only --tar > kinetic-ros_comm-wet.rosinstall $ wstool init -j8 src kinetic-ros_comm-wet.rosinstall

How to modify the commands to make it works? Thanks for any suggestions