anchor.diff:  , avdeviceLibrary ? true
   , avfilterLibrary ? true
   , avformatLibrary ? true
  -, avresampleLibrary ? false  # Libav api compatibility library
   , avutilLibrary ? true
   , postprocLibrary ? true
   , swresampleLibrary ? true
  
positive.code:     "--${boolEn ffmpegProgram}-ffmpeg"
      "--${boolEn ffplayProgram}-ffplay"
      "--${boolEn ffprobeProgram}-ffprobe"
      "--${boolEn ffserverProgram}-ffserver"
      /*
       *  Library flags
       */
  
negative.code: , ffmpegProgram ? true
  , ffplayProgram ? true
  , ffprobeProgram ? true
  , ffserverProgram ? false  # DEPRECATED
  , qtFaststartProgram ? true
  /*
   *  Library options
  