anchor.diff:        ln -s /usr/bin/xcodebuild $tmp
         export PATH="$PATH:$tmp"
       '';
  +    meta.platforms = [ pkgs.lib.platforms.darwin ];
     });
   
     fast-cli = nodePackages."fast-cli-1.x".override {
  
positive.code:     '';
    };
  
    ssb-server = nodePackages.ssb-server.override {
      buildInputs = [ pkgs.automake pkgs.autoconf nodePackages.node-gyp-build ];
    };
  
    tedicross = nodePackages."tedicross-git+https://github.com/TediCross/TediCross.git#v0.8.7".override {
  
negative.code: { pkgs, nodejs, stdenv }:
  
  let
    since = (version: pkgs.lib.versionAtLeast nodejs.version version);
    before = (version: pkgs.lib.versionOlder nodejs.version version);
    nodePackages = import ./composition.nix {
      inherit pkgs nodejs;
      inherit (stdenv.hostPlatform) system;
  