a logout is enough because the session needs to know that your user is in a new group.
pacman -Syu git
don't forget to sent the working changes up to aur in comments
pacman -Syufully update your system, inclusive gcc and glibc
maybe you should not set the driver to sna.
usbfs was dropped in linux 3.5
@sweetthdevil everything is on that page. scroll up one section and see abs
have you seen the optional dependencies for empathy?
is it /usr/lib/xorg/modules/drivers/nvidia_drv.so