anchor.diff:      #"--${boolEn (vapoursynth != null)}-vapoursynth"
       #"--${boolEn (vapoursynth != null)}-vapoursynth-lazy"
       #"--${boolEn (vapoursynth != null)}-vapoursynth-core"
  -    ###"--enable-libaf"
       "--${boolEn (libarchive != null)}-libarchive"
  -    (strNew "--enable-ffmpeg-upstream" "0.28.0")  # Upstream fucked up hard
       "--${boolEn (ffmpeg != null)}-libavdevice"
       "--${boolEn (sdl != null)}-sdl2"
       "--disable-sdl1"
  
positive.code:     ###"--enable-asm"
      "--disable-test"
      "--disable-clang-database"
      "--disable-uwp"  # Windows
      "--disable-win32-internal-pthreads"
      "--enable-iconv"
      "--disable-termios"
      #"--disable-shm"
      "--${boolEn (samba_client != null)}-libsmbclient"
      #"--${boolEn (lua != null)}-lua"
      /**/"--disable-lua"  # FIXME: need lua 5.2
  
negative.code:       sha256 = "d80c86af466589d610a522b0ab20ee7b13630418d846d78bbfeb55930e5ecd59";
      };
      "999" = {
        fetchzipversion = 5;
        version = "2018-01-15";
        rev = "e2a176ede267d93df94b04b5bd7659cf96f954e0";
        sha256 = "26277743ff2f253450902326460aaf275546a3cdb87fa8c394e3f8a75625e316";
      };
    };
    source = sources."${channel}";
  