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