let dummy (sn,sv) pkg number equivs version =
{Cudf.default_package with
Cudf.package = pkg.Cudf.package;
version = version;
conflicts = [(pkg.Cudf.package, None)];
provides = pkg.Cudf.provides;
keep = pkg.Cudf.keep;
pkg_extra = [
("number",`String number);
("architecture",`String "dummy");
("equivs", `String (String.concat "," equivs));
("source", `String sn);
("sourcenumber", `String number)
]
}