anchor.diff:  
     src = fetchurl {
       url = "https://www.kernel.org/pub/software/scm/git/git-${version}.tar.xz";
  -    sha256 = "14hfwfkrci829a9316hnvkglnqqw1p03cw9k56p4fcb078wbwh4b";
  +    sha256 = "1x1y5z3awabmfg7hk6zb331jxngad4nal4507v96bnf0izsyy3qq";
     };
   
     outputs = [ "out" ] ++ stdenv.lib.optional perlSupport "gitweb";
  
positive.code: assert svnSupport -> perlSupport;
  
  let
    version = "2.18.0";
    svn = subversionClient.override { perlBindings = perlSupport; };
  in
  
  
negative.code: 
      # XXX: I failed to understand why this one fails.
      # Could someone try to re-enable it on the next release ?
      # Tested to fail: 2.18.0 and 2.19.0
      disable_test t1700-split-index "null sha1"
  
      # Tested to fail: 2.18.0
  