anchor.diff:  let
   
     mirror = https://get.geo.opera.com/pub/opera/desktop;
  -  version = "53.0.2907.99";
  +  version = "56.0.3051.99";
   
     rpath = stdenv.lib.makeLibraryPath [
   
  
positive.code: 
    src = fetchurl {
      url = "${mirror}/${version}/linux/opera-stable_${version}_amd64.deb";
      sha256 = "0fih5047xv275rmbcr2drji81wxi6p0kyp172mmn328g3pzddmwx";
    };
  
    unpackCmd = "${dpkg}/bin/dpkg-deb -x $curSrc .";
  
negative.code: , libXtst
  , libnotify
  , libpulseaudio
  , libuuid
  , nspr
  , nss
  , pango
  