To start using compiz on Exherbo you have to add the unofficial desktop repository which contains some exheres for compiz, it is hosted on github:

location = ${ROOT}/var/db/paludis/repositories/desktop-unofficial
sync = git://github.com/codejunky/desktop-unofficial.git
format = exheres
names_cache = ${ROOT}/var/cache/paludis/names
write_cache = ${ROOT}/var/cache/paludis/metadata

After syncing the repositories with paludis you have to install the compiz-set:

# paludis -i compiz

After the installtion is complete you should run “fusion-icon” in a terminal to start compiz:

$ fusion-icon

Which adds a tray icon where you can change the window manager to compiz.

IMPORTANT: You have to enable at least the following modules in the compiz settings manager, otherwise it will be very annoying:

- Window Decoration
- Resize Window
- Move Window
- Application Switcher

To get multiple desktops working you need to enable the desktop cube (At least for me it worked not without it).