install the oracle data wrapper extension

Hi

Is there a reliable way to create a database link from PosgreSQL 9.6 to
Oracle 11g?
I am running 9.6 on Linux 64 bit.
I can connect to the Oracle database with sqlplus from the PostgreSQL
server.

Also, I have in attempted to install the oracle_fdw wrapper as an
alternatve, but I keep getting the following error:

ft_node=# create extension oracle_fdw;
ERROR: could not open extension control file
"/usr/share/postgresql/9.6/extension/oracle_fdw.control": No such file or
directory
ft_node=# \conninfo
You are connected to database "ft_node" as user "postgres" on host
"localhost" at port "5432".
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384,
bits: 256, compression: off)

Any suggestions?

P