update from http://archlinux.web.id/?p=171

1.  sudo pacman -Syu
2. sudo pacman -S compiz (then select what do you need, also you may select the compiz-core first, then install another plugins later)
3. after that may take a simple browse to make your desktop environment set, for example “panel, keybinding, software set, or another things which fit your compute style”
4. this is critical things
5. touch ~/.compiz-start.sh
6. chmod +x ~/.compiz-start.sh
7. nano ~/.compiz-start.sh (fill with application do you need to start (example))
8. nano ~/.xinitrc (example)

that is, then you can start with “startx command” when you on terminal 🙂