anchor.diff:        if system == null then {} else { inherit system; }
       ));
       nixpkgsCross = {
  -      ios = 
  +      android = {
  +        arm64 = nixpkgsFunc {
  +          crossSystem =
  +            let cfg = {
  +              config = "aarch64-linux-android";
  +              arch = "arm64";
  +            }; in {
  +            inherit (cfg) config arch;
  +            libc = "glibc";
  +            withTLS = true;
  +            openssl.system = "linux-generic64";
  +            platform = nixpkgs.pkgs.platforms.aarch64-multiplatform;
  +          };
  +          config.allowUnfree = true;
  +        };
  +      };
  +      ios =
           let config = {
                 allowUnfree = true;
                 packageOverrides = p: {
  
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:             };
          in {
          simulator64 = nixpkgsFunc {
            crossSystem =
              let cfg = {
                # You can change config/arch/isiPhoneSimulator depending on your target:
                # aarch64-apple-darwin14 | arm64  | false
  