anchor.diff:      libnotify
       libuuid
       libxcb
  +    libxshmfence
       mesa
       nspr
       nss
  
positive.code: , libnotify
  , libpulseaudio
  , libuuid
  , mesa
  , nspr
  , nss
  
negative.code: in stdenv.mkDerivation rec {
  
    pname = "opera";
    version = "76.0.4017.94";
  
    src = fetchurl {
      url = "${mirror}/${version}/linux/${pname}-stable_${version}_amd64.deb";
      sha256 = "sha256-vjSfzkl1jIQ9P1ARDa0eOuD8CmKHIEZ+IwMB2wIVjE8=";
    };
  
    unpackCmd = "${dpkg}/bin/dpkg-deb -x $curSrc .";
  