anchor.diff:          in lib.mapAttrs (_: args: if args == null then null else nixpkgsFunc args) rec {
           simulator64 = {
             system = "x86_64-darwin";
  -          overlays = globalOverlays ++ [ mobileGhcOverlay appleLibiconvHack ];
  +          overlays = globalOverlays ++ [ mobileGhcOverlay forceStaticLibs ];
             crossSystem = {
               useIosPrebuilt = true;
               # You can change config/arch/isiPhoneSimulator depending on your target:
  
positive.code: 
      mobileGhcOverlay = import ./nixpkgs-overlays/mobile-ghc { inherit lib; };
  
      appleLibiconvHack = self: super: {
        darwin = super.darwin // {
          libiconv =
            if self.hostPlatform == self.buildPlatform
  
negative.code:         };
          aarch64 = {
            system = "x86_64-darwin";
            overlays = globalOverlays ++ [ mobileGhcOverlay forceStaticLibs ];
            crossSystem = {
              useIosPrebuilt = true;
              # You can change config/arch/isiPhoneSimulator depending on your target:
  