So, I was trying to install extension
citext on PostrgeSQL 11.1, but of course I've encountered an error:
ERROR: could not open extension control file "/usr/pgsql-11/share/extension/citext.control": No such file or directory
sudo yum install postgresql-contrib , but dependency for version 9.2 was installed.
So where to find and how to install citext on PostgreSQL 11.1 on CentOS 7.6 ?