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The default is to use the system one if found. If the WXWIN environment variable is set and points to a valid wxWidgets tree, that will be used. Otherwise, it will search the platform specific locations. You can use a local library instead with: cmake -Duse_system_wxwigets=no ... In this case it will look for the WXWIN environment variable and use that or it will download the Audacity specific wxWidgets source. In both cases, wxWidgets will be built as part of the Audacity project.
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.