anchor.diff:      libXrandr.out
       libXrender.out
       libXtst.out
  +    libxcb.out
       libnotify.out
       nspr.out
       nss.out
  
positive.code: let
  
    mirror = https://get.geo.opera.com/pub/opera/desktop;
    version = "41.0.2353.56";
  
    rpath = stdenv.lib.makeLibraryPath [
  
  
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)";
  
  