anchor.diff:          simulator64 = {
             inherit system;
             crossSystem = {
  +            useIosPrebuilt = true;
               # You can change config/arch/isiPhoneSimulator depending on your target:
               # aarch64-apple-darwin14 | arm64  | false
               # arm-apple-darwin10     | armv7  | false
  
positive.code:         arm64 = {
            inherit system;
            crossSystem = {
              # You can change config/arch/isiPhoneSimulator depending on your target:
              # aarch64-apple-darwin14 | arm64  | false
              # arm-apple-darwin10     | armv7  | false
  
negative.code:         armv7 = {
            inherit system;
            crossSystem = {
              useIosPrebuilt = true;
              # You can change config/arch/isiPhoneSimulator depending on your target:
              # aarch64-apple-darwin14 | arm64  | false
              # arm-apple-darwin10     | armv7  | false
  