anchor.diff: -{ lib, stdenv, fetchurl, xlibsWrapper, makeWrapper, libXpm
  -, libXmu, libXi, libXp, Xaw3d, libXaw, fig2dev
  +{ lib
  +, stdenv
  +, fetchurl
  +, xlibsWrapper
  +, makeWrapper
  +, libXpm
  +, libXmu
  +, libXi
  +, libXp
  +, Xaw3d
  +, libXaw
  +, fig2dev
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:     url = "mirror://sourceforge/mcj/xfig-${version}.tar.xz";
      sha256 = "1czamqp0xn0j6qjnasa3fjnrzi072v6qknylr6jrs4gwsfw4ybyw";
    };
  
    postPatch = ''
      sed -i 's:"fig2dev":"${fig2dev}/bin/fig2dev":' src/main.c
  
negative.code: 
    enableParallelBuilding = true;
  
    meta = with lib; {
      description = "An interactive drawing tool for X11";
      longDescription = ''
  