[CentOS] Xorg installation broken under docker

Hi,

I have been trying to build a docker image to run unit tests for the B2G project [1]. However when I try to install Xorg I get this error [2].
I have been searching on web but is still not clear for me if this is an issue or if I should proceed like this link [3] says.
Any idea?

Cheers,
Wander.

[1] https://wiki.mozilla.org/B2G
[2] https://pastebin.mozilla.org/7243239
[3] jperrin.github.io/centos/2014/09/25/centos-docker-and-systemd/