It looks like I'm not the only one that has this. If it helps, here is the list of packages I have installed.

becomeroot, camera, canola, fbreader-maemo2, fmradio, iphome, less, libenca0,libpcap0.8, load-applet, ncurses-base, osso-xterm, pwsafe, statusbarclock, ttf-bitstream-vera, and lastly vim.

compare them to yours, and see if they match. Maybe one of the packages installed it, maybe it didn't.

another option might be to try apt-get install perl as root. (do at your own risk).

edit: I forgot SSH is also installed (not drop bear).