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xcodemacosclang

macOS 'wchar.h' File Not Found

Under OS X 10.9.5 using XCode 6.0.1 I am running into the following issue when I try to run make from the terminal:

fatal error: 'wchar.h' file not found

This issue was not happening prior to a recent upgrade to Mavericks.

Solution

  • 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.