Various hacks you can try on the Mac if things don't work

reinstall_command_line_tools.md

Found this gem on medium

Can help with problems like:

gyp: No Xcode or CLT version detected!
gyp ERR! configure error

TL;DR

Check where (and if) the command line tools are installed

$ xcode-select --print-path
/Library/Developer/CommandLineTools

Delete and re-install:

$ sudo rm -r -f /Library/Developer/CommandLineTools
$ xcode-select --install