OK then, but it's still a fact that 1) any package you get from
"mysql/#downloads" will never be able to fit with an extension,
you can get for your OS ( any OS ) with 'yum'.
Packages from MySQL/Downloads are for test and evaluation only, I think.
I.e. you will have to compile all extensions yourself.
2) No testing OS uses 5.5.11, AFAIK. Debian Sid : mysql 5.1.56,
Fedora 15 : mysql-5.5.10, Fedora 16 : mysql-5.5.10.
... And : CentOS 6 / RHEL 6 : The version is mysql-5.1.52