lib_env.AppendUnique(CPPPATH = ['/usr/local/include'])
lib_env.AppendUnique(LIBPATH = ['/usr/local/lib'])
elif target_os == 'windows':
lib_env.AppendUnique(CPPPATH = ['/usr/local/include'])
lib_env.AppendUnique(LIBPATH = ['/usr/local/lib'])
elif target_os == 'windows':