Actually, where is one to find gdb? It's clearly rattling around somewhere (http://repository.maemo.org/pool/fremantle/free/g/gdb/), but is not in apt-cache with all the maemo and default nokia repos enabled.
Nokia-N900-42-11:~# apt-cache search gdb crash-reporter-dbg - Debug symbols for Crash Reporter gdb - The GNU Debugger libgdbm3 - GNU dbm database routines (runtime version) maemo-debug-scripts - A package installing some debug helper scripts Nokia-N900-42-11:~#