anchor.diff:      meta = with stdenv.lib; {
         description = "A version control system intended to be a compelling replacement for CVS in the open source community";
         license = licenses.asl20;
  -      homepage = http://subversion.apache.org/;
  +      homepage = "http://subversion.apache.org/";
         maintainers = with maintainers; [ eelco lovek323 ];
         platforms = platforms.linux ++ platforms.darwin;
       };
  
positive.code: 
    common = { version, sha256, extraBuildInputs ? [ ] }: stdenv.mkDerivation (rec {
      inherit version;
      name = "subversion-${version}";
  
      src = fetchurl {
        url = "mirror://apache/subversion/${name}.tar.bz2";
        inherit sha256;
      };
  
  
negative.code: 
  in {
    subversion19 = common {
      version = "1.9.12";
      sha256 = "15z33gdnfiqblm5515020wfdwnp2837r3hnparava6m2fgyiafiw";
    };
  
    subversion_1_10 = common {
      version = "1.10.6";
      sha256 = "19zc215mhpnm92mlyl5jbv57r5zqp6cavr3s2g9yglp6j4kfgj0q";
      extraBuildInputs = [ lz4 utf8proc ];
    };
  
  