If you are using OL6.2, the only certified version of the database is Oracle 18.104.22.168.0 or above. This is only available as a patch from My Oracle Support (MOS) (support.oracle.com). When using that against a fully updated OL6.2 host I got no prerequisite failures.
If you are trying to install a previous version of 11.2 (22.214.171.124 or 126.96.36.199) you will get prerequisite failures because they were never intended to be run on OL6. I have installed and run single instance 188.8.131.52 successfully on OL6, so the prerequisite failures are not a problem. Trying to use RAC on OL6 prior to 184.108.40.206 is a total fail.
Note. If this installation is for anything serious, you *must* use 220.127.116.11 or you will not be supported.