anchor.diff:    };
     source = sources."${channel}";
   in
  -
  -# FIXME: reminder to fix this
  -assert source.version == "3.4.2" -> throw "Remove x264 hack";
   
   /*
    *  Licensing dependencies
  
positive.code:     "--${boolEn (libvpx != null)}-libvpx"
      "--${boolEn (wavpack != null)}-libwavpack"
      "--${boolEn (libwebp != null)}-libwebp"
      # FIXME: remove hack for 3.4.2+
      (
        if compareVersions "3.4.2" source.version != 1 then
          "--${boolEn (x264 != null)}-libx264"
        else
          "--disable-libx264"
      )
      "--${boolEn (x265 != null)}-libx265"
      "--${boolEn (xavs != null)}-libxavs"
      #"--${boolEn (libxcb != null)}-libxcb"
  
negative.code: 
    sources = {
      "3.4" = {
        version = "3.4.2";
        multihash = "QmeauNNSeUBumLAq5tkic7FusmmBgynfUSuy7HNt2Xm47x";
        sha256 = "2b92e9578ef8b3e49eeab229e69305f5f4cbc1fdaa22e927fc7fca18acccd740";
      };
      "9.9" = {  # Git
        fetchzipversion = 5;
  