core/catalyst-utils/catalyst-utils.install

post_install(){
    CARD_ATI=$(lspci -n | sed -n "s/.* 0300: 1002:\(....\).*/\1/p")
    if [ "$CARD_ATI" != "" ] && [ $(grep -i "$CARD_ATI" /usr/share/applications/hw_ati_legacy_hwdb) ] ; then
       echo "WARNING WARNING WARNING WARNING"
       echo "--------------------------------"
       echo "ATI LEGACY hardware detected"
       echo "This driver is not compatible, install catalyst-legacy before rebooting."
       echo "sudo pacman -S catalyst-legacy"
       echo "--------------------------------"
       echo "WARNING WARNING WARNING WARNING"
     fi
}

post_upgrade(){
 	post_install
}

whisperer(){
    echo "----------------------------------------------------------------"
    echo "For more info and troubleshooting visit:"
    echo "http://chakra-linux.org/news"
    echo "----------------------------------------------------------------"
}

check_libdri_so(){
    if [ ! -e usr/lib/xorg/modules/extensions/libdri.so ]; then
        ln -sf usr/lib/xorg/modules/extensions/libdri.xorg usr/lib/xorg/modules/extensions/libdri.so
    fi
}

post_install(){
    check_libdri_so
    whisperer
}

post_upgrade(){
    check_libdri_so
    whisperer
}

post_remove(){
    # If the symlink is dead, remove it
     check_libdri_so
     echo "NOTE: Don't forget to recover your original xorg.conf file."
}