I am reposting the C++14 announcement as the date format I used in my previous email created some confusion.
On Centos7 platform one will need to enable devtoolset-7 (please see the instructions bellow).
# 1. Install a package with repository for your system:
# On CentOS, install package centos-release-scl available in CentOS repository:
$ sudo yum install centos-release-scl
# 2. Install the collection:
$ sudo yum install devtoolset-7
# 3. Start using software collections:
$ scl enable devtoolset-7 bash
Please note that this means that it won't be possible to back-port some of the new developments/bugfixes to XRootD4, and hence XRootD4 will reach end of support.