[New Thread] X won't find NVIDIA X driver module

[Orlessan]

For some reason google group won't create a new thread and will keep
puting this message as an answer to an other...

I'm trying to install nvidia drivers in dom0 so I can have dual screen.
But when I execute nvidia-install I have those messages while installing :

You appear to be using a modular X.Org release, but the X library
installation path, 'shmoverride constructor running /usr/lib64',
reported by ' /bin/X -showDefaultLibPath' does not exist. Please check
your X.org installation
You appear to be using a modular X.Org release, but the X library
installation path, 'shmoverride constructor running
/usr/lib64/xorg/modules', reported by ' /bin/X -showDefaultLibPath' does
not exist. Please check your X.org installation
nvidia-installer was forced to guess the X library path
'/usr/lib64' and X module path '/usr/lib64/xorg/modules' ; these paths
were not queryable from the system. If X fails to find the NVIDIA X
driver module, please install the 'pkg-config' utility and the X.org
SDK/development package for your distribution and reinstall the driver

Then I run init 5 and the screen blinks 3 times before giving up with
the Q logo from qubes appearing for a fraction of a second.

Then i run startx and I have the following error :
xinit giving up
xinit unable to connect to x erver : connection refused
xinit server error

Any idea on how to install nvidia drivers in dom0 ?