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The current Makefile has several shortcomings. For instance, it always builds 
everything every time, it doesn't stop on compilation errors, parallel building 
of sources doesn't work, and object files can clash if they're named the same 
thing in different directories.

There are a couple ways to fix this, but rather than fix up the Makefile I 
decided to write a sort of proof of concept CMakeLists.txt to build the 
project. The one attached probably isn't the best way to do it, but for the 
sake of keeping it short (for now) I used aux_source_directory to automatically 
find the source files. The more traditional method is to specifically list each 
source file that's to be included in the project. If you end up wanting to use 
this, that might be a better way to go. Actually, that's the way I included the 
SysWindow sources.

This CMakelists.txt should be put in the Source directory. Then from anywhere, 
a build directory is recommended, run cmake ${path_to_r5ge/Source}. Optionally 
you can pass -DCMAKE_BUILD_TYPE=Debug to enable debugging mode or run ccmake 
${path_to_r5ge/Source} or one of the other CMake GUI's to set CMAKE_BUILD_TYPE.