Postgresql 9.6.x on Openbsd 6.3 ?

[vtypal]

Hello,

At the latest stable release Openbsd v.6.3, postgresql is upgraded on version v.10.
There is some known way to install the previous postgresql version 9.6.x instead of v.10 without downgrade to the previous openbsd stable release?

I didn't find flavours on databases/postgresql port to select specific postgresql version. There is a databases/postgresql-previous port but it seems to be design for pg_upgrade.

Thank you.