macOS ‘wchar.h’ File Not Found

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First ensure that the latest XCode is installed. Next, we need to install/fix/update Command Line Tools. To do so, run

xcode-select --install

Previously, XCode expected it’s active developer directory to be located at

/Applications/Xcode.app/Contents/Developer/

but the latest Command Line Tools is installed to

/Library/Developer/CommandLineTools/

so we need to switch where XCode is looking. To do so, run

sudo xcode-select --switch /Library/Developer/CommandLineTools/

And that should be it. These steps solved the issue for myself and two coworkers.

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