anchor.diff:      meta = with lib; {
         description = "Collection of all the nix-prefetch-* scripts which may be used to obtain source hashes";
         maintainers = with maintainers; [ bennofs ];
  -      platforms = lib.platforms.unix;
  +      platforms = platforms.unix;
       };
     };
   }
  
positive.code:     meta = with lib; {
        description = "Script used to obtain source hashes for fetch${tool}";
        maintainers = with maintainers; [ bennofs ];
        platforms = lib.platforms.unix;
      };
    };
  in rec {
  
negative.code: { lib, stdenv, makeWrapper, buildEnv
  , breezy, coreutils, cvs, findutils, gawk, git, gnused, mercurial, nix, subversion
  }:
  
  let mkPrefetchScript = tool: src: deps:
  