After moving from manual building of ports to a ports-mgmt/synth and local metaport driven build environment, databases/libdbi-drivers are no longer installed along with databases/libdbi, rendering ido2db rather helpless. Instead of simply relying on databases/libdbi, I propose this dependency be changed to databases/libdbi-drivers whenever the option IDOUTILS is selected. Otherwise, a note should be added stating the fact that databases/libdbi-drivers must be installed separately to make ido2db happy.
net-mgmt/icinga-core/files/pkg-message.in already states the facts. However, I think most users would appreciate databases/libdbi-drivers being installed along with net-mgmt/icinga-core.