anchor.diff:  
   let
     inherit (stdenv.lib)
  -    concatStringsSep
  -    optionalString;
  +    concatStringsSep;
   
     inherit ((import ./sources.nix)."${channel}")
       version
  
positive.code:   '';
  
    preFixup = ''
      rm -r $out/share/go/pkg/bootstrap
      rm -r $out/share/go/{doc,misc}
      find "$out" -type f \( -name run -or -name \*.bash -or -name \*.sh \) -delete
      find "$out" -name testdata -prune -exec rm -r {} \;
  
      while read exe; do
        strip $exe || true
  
negative.code: 
      # Remove perl stuff we don't need
      find "$out" -name '*'.pl -print -delete
    '';
  
    setupHook = ./setup-hook.sh;
  