anchor.diff:  }:
   
   let
  -  inherit (stdenv.lib)
  -    enFlag
  -    wtFlag;
  +  inherit (lib)
  +    boolEn
  +    boolWt;
   in
   stdenv.mkDerivation rec {
     name = "faac-${version}";
  
positive.code: { stdenv
  , fetchTritonPatch
  , fetchurl
  
  , mp4v2
  
  
negative.code:   '';
  
    configureFlags = [
      "--${boolEn drmSupport}-drm"
      "--enable-largefile"
      "--${boolWt (mp4v2 != null)}-mp4v2"
    ];
  
    CXXFLAGS = "-std=c++03";
  
    meta = with lib; {
      description = "Open source MPEG-4 and MPEG-2 AAC encoder";
      homepage = http://www.audiocoding.com/faac.html;
      license = licenses.unfreeRedistributable;
  