For CentOS, RHEL please enable the EPEL repository.

yum install wget
## RHEL7, CentOS7:
wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm
rpm -ivh epel-release-7-2.noarch.rpm
## RHEL6, CentOS6:
# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/e/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm

cd /etc/yum.repos.d/
wget http://download.opensuse.org/repositories/isv:ownCloud:desktop/CentOS_7/isv:ownCloud:desktop.repo
yum install owncloud

CAUTION: For RHEL 6/7, we actually build against the respective CentOS repos.

CAUTION: The names CentOS_6, CentOS_7 are used in the packaging test suite.
The names CentOS_CentOS_6, CentOS_CentOS_7 are deprecated, to be removed.