if CLT version is over 10.*, it could not get the version.
version = re.match(r'(\d+\.\d+\.?\d*)', version).groups()

and now latest CLT version is 10.14.

https://developer.apple.com/download/more/?=command%20line%20tools

https://github.com/nodejs/node-gyp/blob/872ee89a8541264ee2d96e162d410f478bba7815/gyp/pylib/gyp/xcode_emulation.py