Wrote a GDK version of Unbounded‘s drawing. Now it’s compile-time-selectable whether the drawing uses Cairo or GDK (Cairo is used if it is available).
The main benefit is that Unbounded compiles on Sarge, though it still requires gtk2hs, which is not in Debian, at build time.
Released Unbounded 1.3. Packaged it, too, but only unofficially. Downloads are here. There is no aptable repository. The debs are signed with my Debian key, there is no separate Debian source. The debs require only stuff that is in Debian.