I can confirm the compilation issue on Linux. When I download the package separately and install it in the normal way (via "Package" > "Load package file") the compiler tells me what is wrong: The person who ported Graphics32 to Linux used some unknown color constants! Replace clButton by clBtnFace etc, and the package will compile fine. Obviously nobody ever has tested the package under Linux.
The problem with this package is that it is not a Lazarus package initially, it is one of the packages that PilotLogic introduced in CodeTyphon. So, the official way would be to report the issue to PilotLogic, then we can put it back into OPM. Otherwise we would fork which is not good unless somebody takes care of the package.