MariaDB 5.5 RPMs are based on OurDelta's 5.1/5.2/5.3 RPMs.
This worked pretty well for RHEL5/CentOS5.
In RHEL6 MySQL packaging was significantly changed and our 5.5 RPMs don't install anymore.
Packaging needs to be fixed to work with RHEL6.
Possibly, we might need to split RPMs to be smaller and more fine-grained.
See attached spec files from Mageia and CentOS6.
Here is the problem.
Vanilla CentOS 6 has Postfix installed by default.
Postfix needs mysql-libs.rpm. And not just any mysql-libs, but libmysqlcient.so from 5.1. We can hack around and provide/obsolete mysql-libs in our RPMs. But we cannot build 5.1 shared libraries from a 5.5 tree.
So, to install MariaDB 5.5 on CentOS 6, a user would need to replace postfix with some other MTA first and uninstall mysql-libs.
Oracle solves this by providing mysql-shared-compat rpm, with a collection of old client libraries. We could do the same...
Let's try to build MariaDB-compat by repackaging MariaDB-shared-5.3 rpm