How do I compile ROS from source using a forked ros_comm

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I haven't tried this solution myself. But this may work:

1. Add --upstream option to rosinstall_generator ros_comm .. command:

rosinstall_generator ros_comm --upstream --rosdistro indigo --deps --wet-only > indigo-ros_comm-wet.rosinstall

1. Modify indigo-ros_comm-wet.rosinstall and change the URI of ros_comm repo to your own fork. Make sure to change the version field to appropriate branch/tag of your fork.

    - git:
    local-name: ros_comm
    uri: https://github.com/asundaresan/ros_comm
    version: 1.11.15

To ensure maximum compatibility, it is a good practice to rebase your changes on top of the current stable version of ros_comm. 1.11.15 in this case.