These are the packages that would be merged, in order:

Calculating dependencies ...

!!! Problem resolving dependencies for =dev-db/plr-8.4.5
 done!
Dependency resolution took 0.84 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=dev-db/plr-8.4.5" has unmet requirements.
- dev-db/plr-8.4.5::gentoo USE="" POSTGRES_TARGETS="-postgres14"

  The following REQUIRED_USE flag constraints are unsatisfied:
    postgres_targets_postgres14

  The above constraints are a subset of the following complete expression:
    any-of ( postgres_targets_postgres14 )