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* AudioIOBase: add missing #include <portaudio.h> This is required for building with system PortAudio library. * CMake: allow building with system PortAudio * CMake: fatal error if use_portaudio=system and use_portmixer=local Signed-off-by: Be <be@mixxx.org>
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.