devtoolset-4-centos7-x86-64 from isv:ownCloud:community:edge project
Select Your Operating System
Add repository and install manually
For CentOS 7 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/isv:ownCloud:community:edge/CentOS_7/isv:ownCloud:community:edge.repo yum install devtoolset-4-centos7-x86-64