def sort_versions(self):
        if self.sorted:
            return
        for orderer in (self.solver.package_orderers or []):
            entries = orderer.reorder(self.entries, key=lambda x: x.package)
            if entries is not None:
                self.entries = entries
                self.sorted = True
                if self.pr:
                    self.pr("sorted: %s packages: %s", self.package_name, repr(orderer))
                return
        self.entries = sorted(self.entries, key=lambda x: x.version, reverse=True)
        self.sorted = True
        if self.pr:
            self.pr("sorted: %s packages: version descending", self.package_name)