opt-libqt4-qt3support from isv:ownCloud:desktop:client-2.2.4 project
Select Your Operating System
Add repository and install manually
For CentOS 6 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/isv:ownCloud:desktop:client-2.2.4/CentOS_6/isv:ownCloud:desktop:client-2.2.4.repo yum install opt-libqt4-qt3support