anchor.diff:    config =
       let fontconfig = config.fonts.fontconfig;
           fcBool = x: "<bool>" + (if x then "true" else "false") + "</bool>";
  -        nixosConf = ''
  +        renderConf = ''
             <?xml version='1.0'?>
             <!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
             <fontconfig>
  
positive.code:       environment.etc."fonts/fonts.conf".source =
          pkgs.makeFontsConf { fontconfig = pkgs.fontconfig_210; fontDirectories = config.fonts.fonts; };
  
        environment.etc."fonts/conf.d/98-nixos.conf".text = nixosConf;
  
        # Versioned fontconfig > 2.10. Take shared fonts.conf from fontconfig.
        # Otherwise specify only font directories.
  
negative.code:             </alias>
              ''}
  
            </fontconfig>
          '';
      in mkIf fontconfig.enable {
  