I just upgraded my alpine system and got this:
(34/147) Upgrading cups-filters (1.0.67-r0 -> 1.0.68-r0)
ERROR: cups-filters-1.0.68-r0: trying to overwrite usr/bin/foomatic-rip
owned by foomatic-filters-4.0.17-r2.
Not sure what the cause or appropriate resolution is, but thought I
should report it. I guess foomatic-rip belongs in foomatic-filters...