Microsoft Universal CRT SDK directory.

def UniversalCRTSdkDir(self):
        """
        Microsoft Universal CRT SDK directory.
        """
        # Set Kit Roots versions for specified MSVC++ version
        if self.vc_ver >= 14.0:
            vers = ('10', '81')
        else:
            vers = ()

        # Find path of the more recent Kit
        for ver in vers:
            sdkdir = self.ri.lookup(self.ri.windows_kits_roots,
                                    'kitsroot%s' % ver)
            if sdkdir:
                break
        return sdkdir or ''