anchor.diff: -{ stdenv, fetchurl, qt4, muparser, which, boost, pkgconfig }:
  +{ stdenv, fetchurl, qt4, qmake4Hook, muparser, which, boost, pkgconfig }:
   
   stdenv.mkDerivation rec {
     version = "2.0.9";
  
positive.code:   '';
  
    buildInputs = [ qt4 muparser which boost ];
    nativeBuildInputs = [ pkgconfig ];
  
    enableParallelBuilding = true;
  
  
negative.code:     sed -i -e s,/usr/share,$out/share, librecad/src/lib/engine/rs_system.cpp
    '';
  
    qmakeFlags = [ "MUPARSER_DIR=${muparser}" "BOOST_DIR=${boost.dev}" ];
  
    installPhase = ''
      mkdir -p $out/bin $out/share
  