Full Xcode (not just comand line tools) required to build repo

[hopskipnfall]

Putting this here for posterity:

So when you xcode-select --install, and then xcode-select --print-path
It says /Library/Developer/CommandLineTools
and building the repo will fail with some
/Library/Developer/CommandLineTools/Platforms/..... doesn't exist, syssomething error
/Library/Developer/CommandLineTools doesn't have a Platforms folder in it
after installing full xcode, xcode-select --print-path changed the path to /Applications/Xcode.app/Contents/Developer
and then it worked fine
For future reference, the error I was seeing looked like this: https://gist.github.com/hopskipnfall/cf1609420eb6116cd737a4026c20140e