Emerging evolution-exchange fails with the following message: checking for LIBEXCHANGE... configure: error: Package requirements (libsoup-2.2 evolution-shell-2.4 libedataserverui-1.2 libexchange-storage-1.2 libbonobo-2.0 libxml-2.0 gconf-2.0) were not met. Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. I have no libexchange-storage.so and no libexchange-storage pkgconfig files, so I'd say it's a safe bet that's what's missing.
You need to have evolution-data-server built with ldap to have libexchange-storage. The ebuild was actually checking for ldap *or* kerberos, not ldap *and* kerberos. I've fixed this check. In the meantime, re-emerge evolution-data-server with ldap and kerberos.
Thanks, that works!