Why rhevm-dwh-setup and rhevm-reports-setup fails with an error?

Issue

• var/log/ovirt-engine/ovirt-history-db-install-2013_07_05_14_07_43.log:

createdb: database creation failed: ERROR:  encoding UTF8 does not match locale en_US <===
DETAIL:  The chosen LC_CTYPE setting requires encoding LATIN1.  <===
Failed to create database ovirt_engine_history  

• var/log/ovirt-engine/ovirt-engine-reports-setup-2013_07_05_14_08_45.log:

/usr/share/jasperreports-server-pro/buildomatic/bin/app-server.xml:60: org.postgresql.util.PSQLException: ERROR: encoding UTF8 does not match locale en_US
  Detail: The chosen LC_CTYPE setting requires encoding LATIN1.

psql -U postgres -l
Password for user postgres: 
                                 List of databases
   Name    |  Owner   | Encoding | Collation  |   Ctype    |   Access privileges   
-----------+----------+----------+------------+------------+-----------------------
 engine    | engine   | UTF8     | en_US.UTF8 | en_US.UTF8 |                       <======
 postgres  | postgres | LATIN1   | en_US      | en_US      | 
 template0 | postgres | LATIN1   | en_US      | en_US      | =c/postgres
                                                           : postgres=CTc/postgres
 template1 | postgres | LATIN1   | en_US      | en_US      | =c/postgres
                                                           : postgres=CTc/postgres