I think the ebuild of www-apps/horde-imp should have a RDEPEND for dev-lang/php[imap] Reproducible: Always
The complete PHP feature checking has to be redone. I think that should be done for H4 when big parts of the current eclass will be obsolete anyway.
Reassigning to web-apps as I'm no longer able to develop Horde packages.
horde.eclass is gone.