The ncurses source package is here:
http://maemo.org/packages/source/vie...-1.maemo1+0m5/

You can see the following binary packages are built from it:
libncurses5
libncurses5-dbg
libncurses5-dev
libncursesw5
libncursesw5-dbg
libncursesw5-dev
ncurses-base

Strangely, if you build it locally you also end up with binary packages ncurses-bin and ncurses-term, but these packages don't seem to be available in the repository.
Ncurses-term contains xterm-256color and the full contents of the terminfo database (2000+ files). According to README.Debian, it "includes many strange and obsolete terminals.".

The changelog for ncurses 5.6+20080713-1 in Debian contains the following:
Unfortunately, Nokia appeared to have forked ncurses from Debian at version 5.4-3.osso1 in August 2006, and missed this fix.

Looking at the ncurses-base binary package:
http://maemo.org/packages/view/ncurses-base/
it is available in the Maemo 5 device root filesystem and the Maemo 5 device SSU repository. Maybe moving xterm-256color from ncurses-term to ncurses-base could be something for CSSU?