title: postgresql: btree_gist does not exist
body: <p>I need to use btree_gist in order to index three fields: a postgis geometry, a date and bigint.</p>
  
  <p>I have postgresql-contrib installed, and I'm able to create the extension without any problem using: <code>CREATE EXTENSION btree_gist;</code> the extension is visible in the extensions list in pgAdmin, but it is not installed according to the command <code>\dx</code> in psql.</p>
  
  <p>Obviously trying to create an index with btree_gist results in an error stating that btree_gist does not exist.</p>
  
  <p>I'm running pqsl 9.5.4.
  Is there something that I'm missing?</p>