libqb-devel is currently an unshipped package. I'd like to request it to be added to CRB so that it can be made available in future releases. This is a blocker for building kronosnet in EPEL 9, which is in turn a blocker for branching and building asterisk in EPEL 9 (see https://bugzilla.redhat.com/show_bug.cgi?id=1768692). Thanks!
My apologies, I merged the MR without doing a full review. This is shipped in the HA add-on and we cannot include it in CRB. I will have to revert this.