anchor.diff:          in nixpkgs.lib.mapAttrs (_: args: if args == null then null else nixpkgsFunc args) {
           simulator64 = {
             system = "x86_64-darwin";
  -          overlays = [globalOverlay appleLibiconvHack];
  +          overlays = globalOverlays ++ [appleLibiconvHack];
             crossSystem = {
               useIosPrebuilt = true;
               # You can change config/arch/isiPhoneSimulator depending on your target:
  
positive.code:     };
      nixpkgs = nixpkgsFunc ({
        inherit system;
        overlays = [globalOverlay];
        config = {
          allowUnfree = true;
          allowBroken = true; # GHCJS is marked broken in 011c149ed5e5a336c3039f0b9d4303020cff1d86
  
negative.code:         };
          armv7a = {
            system = "x86_64-linux";
            overlays = globalOverlays;
            crossSystem = {
              config = "arm-unknown-linux-androideabi";
              arch = "armv7";
  