Looks like the evolution package needs to add a requirement on one of
the ldap packages; the addressbook component can call LDAP directly
(for the configuration dialog, so that it can autodetect things.

Had a report that had this in startup; the addressbook component
wouldn't appear:
(evolution:28268): evolution-shell-WARNING **: Cannot activate
'OAFIID:GNOME_Evolution_Addressbook_Component:2.0': g_module_open of
`/usr/lib/evolution/2.0/components/libevolution-addressbook.so' failed
with `libsasl2.so.2: cannot open shared object file: No such file or
directory'
(evolution:28268): evolution-shell-WARNING **: Cannot activate
'OAFIID:GNOME_Evolution_Exchange_Component:2.0': Child process did not
give an error message, unknown failure occurred

Looks like cyrus-sasl should have been pulled in to supply this.