anchor.diff:        default = false;
         # getEnv part is in check-meta.nix
         defaultText = literalExpression ''false || builtins.getEnv "NIXPKGS_ALLOW_BROKEN" == "1"'';
  -      description = ''
  +      description = lib.mdDoc ''
           Whether to allow broken packages.
   
  -        See <link xlink:href="https://nixos.org/manual/nixpkgs/stable/#sec-allow-broken">Installing broken packages</link> in the NixOS manual.
  +        See [Installing broken packages](https://nixos.org/manual/nixpkgs/stable/#sec-allow-broken) in the NixOS manual.
         '';
       };
   
  
positive.code:       default = false;
        # getEnv part is in check-meta.nix
        defaultText = literalExpression ''false || builtins.getEnv "NIXPKGS_ALLOW_UNFREE" == "1"'';
        description = ''
          Whether to allow unfree packages.
  
          See <link xlink:href="https://nixos.org/manual/nixpkgs/stable/#sec-allow-unfree">Installing unfree packages</link> in the NixOS manual.
        '';
      };
  
  
negative.code:       default = false;
        # getEnv part is in check-meta.nix
        defaultText = literalExpression ''false || builtins.getEnv "NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM" == "1"'';
        description = lib.mdDoc ''
          Whether to allow unsupported packages.
  
          See [Installing packages on unsupported systems](https://nixos.org/manual/nixpkgs/stable/#sec-allow-unsupported-system) in the NixOS manual.
        '';
      };
  
      showDerivationWarnings = mkOption {
        type = types.listOf (types.enum [ "maintainerless" ]);
        default = [];
        description = lib.mdDoc ''
          Which warnings to display for potentially dangerous
          or deprecated values passed into `stdenv.mkDerivation`.
  
          A list of warnings can be found in
          [/pkgs/stdenv/generic/check-meta.nix](https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/check-meta.nix).
  
          This is not a stable interface; warnings may be added, changed
          or removed without prior notice.
  