In the FMS 4 timeframe, CentOS 6 was little far, and hence I am not sure if that is take care of. But it still does not mean FMS should not work, as suggested in this thread, there must be some kind of dependency issues that I doubt are causing the trouble. I tried on RHEL 6 and there were no issues in running FMS (the installation was blocked and we have to make a workaround to allow the installation by editing the installer script). I believe it should work seemless on CentOS too. Did you try FMS 4.5 ?
Thank you !