anchor.diff:  with stdenv.lib;
   
   let
  -  baseVersion = "4.2";
  -  revision = "1";
  +  baseVersion = "4.3";
  +  revision = "0";
   in
   
   stdenv.mkDerivation rec {
  
positive.code:   version = "${baseVersion}.${revision}";
  
    src = fetchurl {
      url = "http://download.qt-project.org/official_releases/qtcreator/${baseVersion}/${version}/qt-creator-opensource-src-${version}.tar.gz";
      sha256 = "0f2slaf579q2anflf524lbhmpwrwy3hzjfxzs10n44r7s7yc4dr5";
    };
  
    buildInputs = [ qtbase qtscript qtquickcontrols qtdeclarative ];
  
negative.code:   '';
  
    postInstall = ''
      substituteInPlace $out/share/applications/org.qt-project.qtcreator.desktop \
        --replace "Exec=qtcreator" "Exec=$out/bin/qtcreator"
      wrapQtProgram $out/bin/qtcreator
    '';
  
  