anchor.diff:  in
   
   stdenv.mkDerivation {
  -  inherit name version;
  +  inherit pname version;
     src = fetchurl {
       url = "mirror://sourceforge/hylafax/hylafax-${version}.tar.gz";
       inherit sha256;
  
positive.code: 
  let
  
    name = "hylafaxplus-${version}";
    version = "7.0.3";
    sha256 = "139iwcwrn9i5lragxi33ilzah72w59wg4midfjjgx5cly3ah0iy4";
  
    configSite = substituteAll {
      name = "hylafaxplus-config.site";
      src = ./config.site;
      config_maxgid = lib.optionalString (maxgid!=null) ''CONFIG_MAXGID=${builtins.toString maxgid}'';
      ghostscript_version = ghostscript.version;
  
negative.code:   };
  
    postInstall = substituteAll {
      name = "${pname}-post-install.sh";
      src = ./post-install.sh;
      inherit fakeroot libfaketime;
    };
  