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gprim/geom2d.cpp includes mystdlib.h, which already has a fallback define for M_PI. As geomfuncs.cpp also includes mystdlib.h, use M_PI instead of a truncated value. occ/Partition_Loop2d.cxx already gets M_PI from the opencascade headers (~everything includes Standard_Real.hxx, which includes Standard_math.hxx, which sets _USE_MATH_DEFINES for Windows and includes math.h).