core/catalyst-utils/catalyst-utils.install

whisperer(){
    echo "----------------------------------------------------------------"
    echo "WARNING WARNING WARNING WARNING"
    echo "--------------------------------"
    echo "For ATI HD 4xxxx and below graphics users:"
    echo "This driver is not compatible, install catalyst-legacy before rebooting."
    echo "sudo pacman -S catalyst-legacy"
    echo "You can use the tool 'aticonfig' to regenerate an xorg.conf file."
    echo "Further reading: http://chakra-project.org/bbs/viewtopic.php?pid=56704#p56704"
    echo "--------------------------------"
    echo "WARNING WARNING WARNING WARNING"
    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."
}