Installation documentation (http://tuleap-documentation.readthedocs.io/en/latest/administration-guide/realtime.html) not up-to-date. The plugin cannot be installed when following the instructions.

The documentation says:

The first step consists to configure yum in order to exclude nodejs packages. Edit the file ‘/etc/yum.conf’ with:

# NodeJS from scl seems to conflict with NodeJS from epel
# hence, exclude everything that come from scl for node related
# stuff
exclude=nodejs-*

You can now install the tuleap-realtime package:
$ yum install tuleap-realtime

 But this leads to an error:

# yum install tuleap-realtime
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: ftp.halifax.rwth-aachen.de
 * epel: vesta.informatik.rwth-aachen.de
 * extras: mirror.maeh.org
 * updates: mirror.maeh.org
Resolving Dependencies
--> Running transaction check
---> Package tuleap-realtime.noarch 0:1.3.0-1 will be installed
--> Processing Dependency: nodejs for package: tuleap-realtime-1.3.0-1.noarch
--> Processing Dependency: supervisor for package: tuleap-realtime-1.3.0-1.noarch
--> Running transaction check
---> Package supervisor.noarch 0:2.1-9.el6 will be installed
--> Processing Dependency: python-meld3 for package: supervisor-2.1-9.el6.noarch
---> Package tuleap-realtime.noarch 0:1.3.0-1 will be installed
--> Processing Dependency: nodejs for package: tuleap-realtime-1.3.0-1.noarch
--> Running transaction check
---> Package python-meld3.x86_64 0:0.6.7-1.el6 will be installed
---> Package tuleap-realtime.noarch 0:1.3.0-1 will be installed
--> Processing Dependency: nodejs for package: tuleap-realtime-1.3.0-1.noarch
--> Finished Dependency Resolution
Error: Package: tuleap-realtime-1.3.0-1.noarch (Tuleap)
           Requires: nodejs