pgrounting extension in 11

[root@hkgrhepdbp001 ~]# yum install pgrouting_11
Loaded plugins: enabled_repos_upload, package_upload, product-id, rhnplugin, search-disabled-repos, security, subscription-manager
This system is not registered with RHN Classic or RHN Satellite.
You can use rhn_register to register.
RHN Satellite or RHN Classic support will be disabled.
Setting up Install Process
rhel-6-server-rpms                                                                                                                    | 2.0 kB     00:00
tnc_TNC_Nielsen_tnc_nielsen_rpms                                                                                                      | 2.1 kB     00:00
No package pgrouting_11 available.
Error: Nothing to do
Uploading Enabled Repositories Report
Loaded plugins: product-id, rhnplugin

==> ./psql -p 5434
psql (11.5)
Type "help" for help.


postgres=# create extension pgrouting;
ERROR:  could not open extension control file "/usr/pgsql-11/share/extension/pgrouting.control": No such file or directory
postgres=#
postgres=#

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