anchor.diff:  
         VERSION_SUFFIX = suffix;
   
  -      outputs = [ "out" "dev" "man" "doc" ];
  +      outputs =
  +        [ "out" "dev" ]
  +        ++ lib.optionals enableDocumentation [ "man" "doc" ];
   
         nativeBuildInputs =
           [ pkg-config ]
           ++ lib.optionals stdenv.isLinux [ util-linuxMinimal ]
  +        ++ lib.optionals (is24 && enableDocumentation) [
  +          (lib.getBin lowdown) mdbook
  +        ]
           ++ lib.optionals is24
             [ autoreconfHook
               autoconf-archive
               bison flex
  -            (lib.getBin lowdown) mdbook
               jq
              ];
   
  
positive.code:           "--sysconfdir=${confDir}"
            "--enable-gc"
          ]
          ++ lib.optionals (!is24) [
            # option was removed in 2.4
            "--disable-init-state"
  
negative.code:         license = lib.licenses.lgpl2Plus;
          maintainers = [ lib.maintainers.eelco ];
          platforms = lib.platforms.unix;
          outputsToInstall = [ "out" ] ++ lib.optional enableDocumentation "man";
        };
  
        passthru = {
  