-extern const char *solver_select2str(Pool *pool, Id select, Id what);
-extern const char *pool_job2str(Pool *pool, Id how, Id what, int withflags);
-extern const char *solver_problemruleinfo2str(Solver *solv, SolverRuleinfo type, Id source, Id target, Id dep);
-extern const char *solver_solutionelement2str(Solver *solv, Id p, Id rp);
-extern const char *policy_illegal2str(Solver *solv, int illegal, Solvable *s, Solvable *rs);