anchor.diff:              };
           in {
           simulator64 = nixpkgsFunc {
  -          crossSystem = 
  +          crossSystem =
               let cfg = {
                 # You can change config/arch/isiPhoneSimulator depending on your target:
                 # aarch64-apple-darwin14 | arm64  | false
  
positive.code:           inherit config;
          };
          arm64 = nixpkgsFunc {
            crossSystem = 
              let cfg = {
                # You can change config/arch/isiPhoneSimulator depending on your target:
                # aarch64-apple-darwin14 | arm64  | false
  
negative.code:       if system == null then {} else { inherit system; }
      ));
      nixpkgsCross = {
        ios =
          let config = {
                allowUnfree = true;
                packageOverrides = p: {
  