anchor.diff:    sourceInfo = rec {
       baseName="smbnetfs";
       dirBaseName="SMBNetFS";
  -    version = "0.5.3b";
  +    version = "0.6.0";
       name="${baseName}-${version}";
       project="${baseName}";
       url="mirror://sourceforge/project/${project}/${baseName}/${dirBaseName}-${version}/${name}.tar.bz2";
  
positive.code: x@{builderDefsPackage
    , fuse, samba, pkgconfig
    , ...}:
  builderDefsPackage
  (a :  
  
negative.code: rec {
    src = a.fetchurl {
      url = sourceInfo.url;
      sha256 = "16sikr81ipn8v1a1zrqgnsy2as3zcaxbzkr0bm5vxy012bq0plkd";
    };
  
    inherit (sourceInfo) name version;
  