I don't know the build manager thing... Maybe some setting in some package?
If you have a working IDE of any kind, try rebuilding from inside the IDE. Normally in the "Tools" menu, but may be "preferences" on Mac. Not sure....
Copying colors.
Your primary config path is normally .lazarus in your home dir. But you can check in menu View > Ide Internals > About IDE
If you haven't specified anything then your new IDE should use the same, and should therefore have the colors (but would also modify your other IDEs config).
You can start the ide with the argument --pcp=....... to have separate config.
You can also put that into a file called lazarus.cfg in the lazarus dir (but I am not sure on exact details for Mac).
You can check in "About IDE" if it worked.
Colors are in the file EditorOptions.xml
And that file can normally be copied between different Lazarus configs.
Other config files have paths in them, and if you copy then you may get weird results.