anchor.diff: -{ stdenv, makeWrapper, git, subversion, mercurial, bazaar, cvs, unzip, curl }:
  +{ stdenv, makeWrapper, git, subversion, mercurial, bazaar, cvs, unzip, curl, gnused }:
   
   stdenv.mkDerivation {
     name = "nix-prefetch-scripts";
  
positive.code:       cp $src $out/bin/$name;
        for dep in ''${@:3}; do
          local exe=$dep/bin;
          local wrapArgs="$wrapArgs --suffix PATH : $exe"
        done
        wrapProgram $out/bin/$name $wrapArgs
      }
  
negative.code:     copyScript "hg" ${../../../build-support/fetchhg/nix-prefetch-hg} ${mercurial}
      copyScript "git" ${../../../build-support/fetchgit/nix-prefetch-git} ${git}
      copyScript "svn" ${../../../build-support/fetchsvn/nix-prefetch-svn} ${subversion}
      copyScript "bzr" ${../../../build-support/fetchbzr/nix-prefetch-bzr} ${bazaar} ${gnused}
      copyScript "cvs" ${../../../build-support/fetchcvs/nix-prefetch-cvs} ${cvs}
      copyScript "zip" ${./nix-prefetch-zip} ${unzip} ${curl}
    '';
  