anchor.diff:    meta = {
       homepage = http://www.opera.com;
       description = "Web browser";
  +    platforms = [ "x86_64-linux" ];
       license = stdenv.lib.licenses.unfree;
     };
   }
  
positive.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 .";
  
  
negative.code: let
  
    mirror = https://get.geo.opera.com/pub/opera/desktop;
    version = "48.0.2685.52";
  
    rpath = stdenv.lib.makeLibraryPath [
  
  