anchor.diff: -{ stdenv, fetchurl, nspr, perl, zlib, sqlite, fixDarwinDylibNames, buildPackages, ninja }:
  +{ stdenv, fetchurl, nspr, perl, zlib, sqlite, darwin, fixDarwinDylibNames, buildPackages, ninja }:
   
   let
     nssPEM = fetchurl {
  
positive.code: 
    depsBuildBuild = [ buildPackages.stdenv.cc ];
  
    nativeBuildInputs = [ perl ninja (buildPackages.python3.withPackages (ps: with ps; [ gyp ])) ];
  
    buildInputs = [ zlib sqlite ]
      ++ stdenv.lib.optional stdenv.isDarwin fixDarwinDylibNames;
  
negative.code:     ];
  
    patchFlags = [ "-p0" ];
  
    outputs = [ "out" "dev" "tools" ];
  
  