anchor.diff:      #"--${boolEn (tesseract != null)}-libtesseract"
       /**/"--disable-libtesseract"
       "--${boolEn (libtheora != null)}-libtheora"
  +    /**/"--disable-libtls"  # libressl
       #"--${boolEn (twolame != null)}-libtwolame"
       /**/"--disable-libtwolame"
       "--${boolEn (v4l_lib != null)}-libv4l2"
  
positive.code:     "--${boolEn ffmpegProgram}-ffmpeg"
      "--${boolEn ffplayProgram}-ffplay"
      "--${boolEn ffprobeProgram}-ffprobe"
      "--${boolEn ffserverProgram}-ffserver"
      /*
       *  Library flags
       */
  
negative.code:     };
      "9.9" = { # Git
        fetchzipversion = 5;
        version = "2018.01.08";
        rev = "ed03fad2cc523480a7ec385fb3e9bf876769acce";
        sha256 = "722809dfde1e91ce0e49577dd0c1ac2046eb567bc22a8c8d1bd8b46766b27939";
      };
    };
    source = sources."${channel}";
  