M_PI undefined in test code · Issue #564 · glfw/glfw · GitHub
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VS Build error, 'M_PI': undeclared identifier, and other strange error · Issue #17 · xbpeng/DeepMimic · GitHub
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Windows: M_PI undefined · Issue #166 · Samsung/rlottie · GitHub
Was not declared in this scope" :( - Programming Questions - Arduino Forum
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M_PI' undefined Error, compiling ximgproc module for Visual Studio 2017 on Windows · Issue #1273 · opencv/opencv_contrib · GitHub
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