anchor.diff:  let
     inherit (stdenv)
       targetSystem;
  -  inherit (stdenv.lib)
  +  inherit (lib)
       boolEn
       boolString
       elem
  
positive.code:     "--with-fileio=${boolString (libsndfile != null) "sndfile" "lame"}"
    ];
  
    meta = with stdenv.lib; {
      description = "A high quality MPEG Audio Layer III (MP3) encoder";
      homepage = http://lame.sourceforge.net;
      license = licenses.lgpl2;
  
negative.code:   configureFlags = [
      "--disable-maintainer-mode"
      "--enable-largefile"
      "--${boolEn (elem targetSystem platforms.x86-all)}-nasm"
      "--enable-rpath"
      "--enable-cpml"
      "--disable-gtktest"
  