anchor.diff:    ];
   
     configureFlags = [
  -    "--help"
       "--disable-aac"
       # TODO: adplug support
       #"--${boolEn }-adplug" true null)
  
positive.code:     "--enable-wave-encoder"
      "--${boolEn (wavpack != null)}-wavpack"
      "--${boolWt (avahi != null && dbus != null)}-zeroconf${
          boolString (avahi != null && dbus != null) "avahi" ""}"
      "--${boolEn (zlib != null)}-zlib"
      "--${boolEn (zziplib != null)}-zzip"
      "--${boolWt (systemd_lib != null)}-systemdsystemunitdir${
          boolString (systemd_lib != null) "$(out)/etc/systemd/system" ""}"
      "--disable-debug"
      "--${boolEn documentationSupport}-documentation"
      "--disable-werror"
  
negative.code: let
    inherit (stdenv.lib)
      boolEn
      boolString
      boolWt
      optional
      optionals;
  