/* * Include (specific) solvable * * Including a Solvable explicitly means that this Solvable _must_ be installed. * * Including a Solvable by name means that one Solvable * with the given name must be installed. The solver is free to * choose one. * * Including a Solvable by relation means that any Solvable * providing the given relation must be installed. * * call-seq: * solver.include(solvable) * solver.include("kernel") * solver.include(relation) * */ void include( XSolvable *xs )