a logout is enough because the session needs to know that your user is in a new group.
pacman -Syu git
pacman -Syufully update your system, inclusive gcc and glibc
don't forget to sent the working changes up to aur in comments
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