C:\Projects\alacrt\src\utils\transform.cpp: In function 'void projectMercator(const FloatPoint&, coord_t&, coord_t&)':
C:\Projects\alacrt\src\utils\transform.cpp:88:31: error: 'M_PI' was not declared in this scope
C:\Projects\alacrt\src\utils\transform.cpp: In function 'void inverseMercator(const FixedPoint&, double&, double&)':
C:\Projects\alacrt\src\utils\transform.cpp:104:31: error: 'M_PI' was not declared in this scope
mingw32-make[2]: *** [CMakeFiles/alacarte-importer.dir/src/utils/transform.cpp.obj] Error 1
mingw32-make[1]: *** [CMakeFiles/alacarte-importer.dir/all] Error 2
mingw32-make: *** [all] Error 2