Hi Li, > $(if $(REQ_VERSION_MAJOR),,$(error You must define REQ_VERSION_MAJOR)) > -$(if $(REQ_VERSION_PATCH),,$(error You must define REQ_VERSION_MINOR)) > +$(if $(REQ_VERSION_PATCH),,$(error You must define REQ_VERSION_PATCH)) Good catch! Reviewed-by: Petr Vorel <pvorel@suse.cz> Kind regards, Petr