anchor.diff:  
   let
     version = "5.9.1";
  -  major = "5.9";
   
     docFiles = [
       (fetchurl {
  -      url = "https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v${major}&type=data&os=Sources&downloadFile=ParaViewTutorial-${version}.pdf";
  +      url = "https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v${lib.versions.majorMinor version}&type=data&os=Sources&downloadFile=ParaViewTutorial-${version}.pdf";
         name = "Tutorial.pdf";
         sha256 = "1knpirjbz3rv8p8n03p39vv8vi5imvxakjsssqgly09g0cnsikkw";
       })
       (fetchurl {
  -      url = "https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v${major}&type=data&os=Sources&downloadFile=ParaViewGettingStarted-${version}.pdf";
  +      url = "https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v${lib.versions.majorMinor version}&type=data&os=Sources&downloadFile=ParaViewGettingStarted-${version}.pdf";
         name = "GettingStarted.pdf";
         sha256 = "14xhlvg7s7d5amqf4qfyamx2a6b66zf4cmlfm3s7iw3jq01x1lx6";
       })
       (fetchurl {
  -      url = "https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v${major}&type=data&os=Sources&downloadFile=ParaViewCatalystGuide-${version}.pdf";
  +      url = "https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v${lib.versions.majorMinor version}&type=data&os=Sources&downloadFile=ParaViewCatalystGuide-${version}.pdf";
         name = "CatalystGuide.pdf";
         sha256 = "133vcfrbg2nh15igl51ns6gnfn1is20vq6j0rg37wha697pmcr4a";
       })
  
positive.code:   ];
  
    buildInputs = [
      libGLU libGL
      libXt
      mpi
      tbb
  
negative.code:     qtsvg
    ];
  
    postInstall = let docDir = "$out/share/paraview-${lib.versions.majorMinor version}/doc"; in
      lib.optionalString withDocs ''
        mkdir -p ${docDir};
        for docFile in ${lib.concatStringsSep " " docFiles}; do
  