Posted to devinfo last night:
I have built RPMs of Horde 2.2.1, IMP 3.2.1, and Turba 1.2 for SME
5.6; they'll be available in a couple of hours in my contrib area.
Also available are updated e-smith-horde-1.7.0, e-smith-imp-1.9.0,
and e-smith-turba-1.1.0 (not -1.1) RPMs. They've been tested a bit
on SME 5.6, not at all on prior versions. Feedback, as always, is
appreciated.