I got tired of having no working GUI for VBA-M on Linux, so I ported the old GTK GUI to the new code base. It required only a few changes to compile. The new HQ4x scalers are missing, and there are propably a lot of other bugs. It's also not very fast right now, but it's enough for me. It should be buildable on Windows and MacOS without too much changes.
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I added a CMake project that can compile the SDL and the GTK port. CMake is a very powerful (unlike qmake) and easy to use (unlike the autotools) build system that generates native project files (makefiles for linux, VC projects for Windows, and XCode projects for MacOS)