env.AppendUnique(CPPDEFINES = [
'_GDI32_', # prevent wgl* being declared __declspec(dllimport)
'BUILD_GL32', # declare gl* as __declspec(dllexport) in Mesa headers
env.AppendUnique(CPPDEFINES = [
'_GDI32_', # prevent wgl* being declared __declspec(dllimport)
'BUILD_GL32', # declare gl* as __declspec(dllexport) in Mesa headers