syntax error at or near "gist_trgm_ops" on debian

[Philippe Strauss <philippe@xxxxxxxxxxxxxxx>]

Hello Postgres users,

I'm Philippe from switzerland,

I want to build a trigram index in a mycology database of mine, 
currently running on a debian laptop, and facing the following issue:


diskpix=> CREATE INDEX idx_trgm_genus ON myco.genus USING GIST 
(myco.genus.name gist_trgm_ops);
ERROR:  syntax error at or near "gist_trgm_ops"
LINE 1: ...m_genus ON myco.genus USING GIST (myco.genus.name gist_trgm_...


I've installed the postgresql-contrib package, rebooted my box, then 
created the trgm extension using:


CREATE EXTENSION pg_trgm;


But it still does not work, what am I missing?

--
Philippe Strauss
https://straussengineering.ch/