anchor.diff:  
     rewrite-tbd = callPackage ../os-specific/darwin/rewrite-tbd { };
   
  -  checkReexportsHook = makeSetupHook {
  +  checkReexportsHook = pkgs.makeSetupHook {
       deps = [ pkgs.darwin.print-reexports ];
     } ../os-specific/darwin/print-reexports/setup-hook.sh;
   
  
positive.code: 
    binutils-unwrapped = callPackage ../os-specific/darwin/binutils {
      inherit (pkgs) binutils-unwrapped;
      inherit (pkgs.llvmPackages_7) llvm clang-unwrapped;
    };
  
    binutils = pkgs.wrapBintoolsWith {
  
negative.code: 
    iproute2mac = callPackage ../os-specific/darwin/iproute2mac { };
  
    libobjc = self.objc4;
  
    lsusb = callPackage ../os-specific/darwin/lsusb { };
  
  