xeus-cling: mark as working on darwin

    passthru = (oldAttrs.passthru or { }) // {

      unwrapped = xeus-cling-unwrapped;

    };

    meta.badPlatforms = [

      # fatal error: 'stdlib.h' file not found

      lib.systems.inspect.patterns.isDarwin

    ];

  });

  mkKernelSpec = std: {