anchor.diff:  let
   
     mirror = https://get.geo.opera.com/pub/opera/desktop;
  -  version = "45.0.2552.898";
  +  version = "46.0.2597.39";
   
     rpath = stdenv.lib.makeLibraryPath [
   
  
positive.code: , gdk_pixbuf
  , glib
  , gnome2
  , gtk2
  , libX11
  , libxcb
  , libXScrnSaver
  
negative.code:   name = "opera-${version}";
  
    src =
      #if stdenv.system == "i686-linux" then
      #  fetchurl {
      #    url = "${mirror}/${version}/linux/opera-stable_${version}_i386.deb";
      #    sha256 = "...";
      #  }
      #else 
      if stdenv.system == "x86_64-linux" then
        fetchurl {
          url = "${mirror}/${version}/linux/opera-stable_${version}_amd64.deb";
          sha256 = "1ladvqilm5rr222wjybvribnyii2l0p8jbsd10xr06wps63g1kia";
        }
      else throw "Opera is not supported on ${stdenv.system} (only x86_64 linux is supported)";
  
    unpackCmd = "${dpkg}/bin/dpkg-deb -x $curSrc .";
  
  