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roscore is built by the catkin_make_isolated command you ran before and no longer by rosmake. That is why it reports being built already when you run rosmake rosout.

It seems more likely that you forgot to source the setup.bash file? The other thing to check is that you actually have rosout in your workspace and that you built it. But if you are following the from source instructions then you should have it.

You said "I installed ROS Indigo through homebrew on Mac Mavericks". Does that mean you are following this tutorial?:

http://wiki.ros.org/indigo/Installation/OSX/Homebrew/Source