Need qt47 Software on my CentOS 5.6 Linux

I’m trying to compile VirtualBox which runs for quite a long time on my CentOS 5.6 Linux. Afterwards, it complains that there are invalid options to Irelease. I’ve done everything to resolve the issue to no avail. I already search for the program qt47 but I could not find it. I only find qt3 so I want to know if someone here has the same issue that they manage to resolve. If so, please help me fix this. Where can I download qt47 and if you have an alternative resolution, kindly inform me. Thanks in advance.
