anchor.diff:        android = nixpkgs.lib.mapAttrs (_: args: if args == null then null else nixpkgsFunc args) rec {
           arm64 = {
             system = "x86_64-linux";
  -          overlays = [globalOverlay];
  +          overlays = globalOverlays;
             crossSystem = {
               config = "aarch64-unknown-linux-android";
               arch = "arm64";
  
positive.code:         in nixpkgs.lib.mapAttrs (_: args: if args == null then null else nixpkgsFunc args) {
          simulator64 = {
            system = "x86_64-darwin";
            overlays = [globalOverlay appleLibiconvHack];
            crossSystem = {
              useIosPrebuilt = true;
              # You can change config/arch/isiPhoneSimulator depending on your target:
  
negative.code:         };
          armv7a = {
            system = "x86_64-linux";
            overlays = globalOverlays;
            crossSystem = {
              config = "arm-unknown-linux-androideabi";
              arch = "armv7";
  