anchor.diff:        derivationArg =
           (removeAttrs attrs
             ["meta" "passthru" "crossAttrs" "pos"
  +           "doCheck" "doInstallCheck"
              "__impureHostDeps" "__propagatedImpureHostDeps"
              "sandboxProfile" "propagatedSandboxProfile"])
           // (let
  
positive.code:         (stdenv.hostPlatform != stdenv.buildPlatform)
          [ "build" "host" ]
  
      # Check phase
      , doCheck ? false
  
      # InstallCheck phase
      , doInstallCheck ? false
  
      , crossConfig ? null
      , meta ? {}
  
negative.code:           __propagatedImpureHostDeps = computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps;
          } // lib.optionalAttrs (outputs' != [ "out" ]) {
            outputs = outputs';
          } // lib.optionalAttrs doCheck' {
            doCheck = true;
          } // lib.optionalAttrs doInstallCheck' {
            doInstallCheck = true;
          });
  
        validity = import ./check-meta.nix {
  