Thank you jggimi
I could manage to reinstall the latest 6.2 postgres stable port. What i'm afraid of, is the postgresql 10.x dependenciy of other ports.For example libreoffice depends from
eb8470p# pkg_info -f libreoffice | grep '^@depend' | grep postgres
@depend databases/postgresql,-main
ostgresql-client-*
ostgresql-client-10.3
So, in order to avoid to replace the current stable 10.x postgres release, i should isolate the 9.6.8 to other directory.
Thank you again for the suggestion
Regards,