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As you can see from the original CMakeLists.txt into the sources of Portaudio, the file pa_x86_plain_converters.c can be compiled only with Visual C++, so it should not be include if there is not the Microsoft Compiler.
CMake requires that its CMakeList.txt files follow the directory structure of the projects. However, for Audacity this would cause collision with existing CMakeList.txt files that e.g. expat and libsoxr already provide. Our solution is to have this proxy directory for lib-src to hold our version of the CMakeList.txt files. We did try bundling several libraries under one CMakeList.txt without using subdirectories. However, we were then fighting CMake too much - and did not have a clean separation of information between sub projects. We don't need the proxies for our own 'lib_src' such as mod-script-pipe and FileDialog, where we 'own' the CMakeList.txt file.