anchor.diff:            };
             config.allowUnfree = true;
           };
  -        armv7aImpure = if system != "x86_64-linux" then null else armv7a // {
  +        armv7aImpure = armv7a // {
             crossSystem = armv7a.crossSystem // { useAndroidPrebuilt = true; };
           };
         };
  
positive.code:           };
            inherit config;
          };
          arm64 = if system != "x86_64-darwin" then null else {
            inherit system;
            overlays = [globalOverlay];
            crossSystem = {
              useIosPrebuilt = true;
  
negative.code:           };
            config.allowUnfree = true;
          };
          arm64Impure = arm64 // {
            crossSystem = arm64.crossSystem // { useAndroidPrebuilt = true; };
          };
          armv7a = {
            system = "x86_64-linux";
            overlays = [globalOverlay];
            crossSystem = {
              config = "arm-unknown-linux-androideabi";
  