anchor.diff:  let
   
     mirror = https://get.geo.opera.com/pub/opera/desktop;
  -  version = "41.0.2353.56";
  +  version = "42.0.2393.517";
   
     rpath = stdenv.lib.makeLibraryPath [
   
  
positive.code:     libXrandr.out
      libXrender.out
      libXtst.out
      libnotify.out
      nspr.out
      nss.out
  
negative.code:     if stdenv.system == "i686-linux" then
        fetchurl {
          url = "${mirror}/${version}/linux/opera-stable_${version}_i386.deb";
          sha256 = "1zdhg6lrnpn8f4rdibnagj3ps3i8s9ygm4dpj5h605rqk24xxpvs";
        }
      else if stdenv.system == "x86_64-linux" then
        fetchurl {
          url = "${mirror}/${version}/linux/opera-stable_${version}_amd64.deb";
          sha256 = "04yklvxprl7kcnl43fmvk1qfj5ifvivj715n26ylzcf29pvcy1mp";
        }
      else throw "Opera is not supported on ${stdenv.system} (only i686-linux and x86_64 linux are supported)";
  
  