* steps to reproduce:
-----
~ # pacman -S compiz

* result:
resolving dependencies... -----
warning: cannot resolve "libglade", a dependency of "pygtk"
warning: cannot resolve "python2-cairo", a dependency of "pygtk"
warning: cannot resolve "python2-gobject2", a dependency of "pygtk"
warning: cannot resolve "pygtk", a dependency of "compiz"
warning: cannot resolve "pyrex", a dependency of "compiz"
:: The following package cannot be upgraded due to unresolvable dependencies:
compiz
:: Do you want to skip the above package for this upgrade? [y/N] output lists off various unmet dependencies

* # clue(s):
Seems -----
-Seems this may be due to the recent Python2 purge from Parabola/Arch