message: Use cmake3 if it's available
diff: @@ -33,7 +33,7 @@ ONNX_NAMESPACE = os.getenv('ONNX_NAMESPACE', DEFAULT_ONNX_NAMESPACE)
  WINDOWS = (os.name == 'nt')
  -CMAKE = find_executable('cmake')
  +CMAKE = find_executable('cmake3') or find_executable('cmake')
  MAKE = find_executable('make')
  install_requires = []
  