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$ROS_ROOT/core/rosbuild/rosconfig.cmake is where ros configuration starts. There are three places ros looks for rosconfig.cmake, and if you parse rosbuild's rosconfig.cmake, you'll find it essentially does the following:

1) $ROS_ROOT/rosconfig.cmake - this is the user's configuration file. 2) <pkg>/rosconfig.cmake - overrides the user's configuration file for a single package.

If neither of the above are found, or not all configuration variables are set:

3) rosbuild/rosconfig.cmake finally sets some sane defaults.

$ROS_ROOT/core/rosbuild/rosconfig.cmake is where ros configuration starts. There are three places ros looks for rosconfig.cmake, and if you parse rosbuild's rosconfig.cmake, you'll find it essentially does the following: