For Harmattan, specifically... you probably won't find anything. But seeing as though this is just Linux, your nearest Debian mirror should probably have the required armel debs.

Have a look at the files in /etc/apt/sources.list.d/ create a new file in there (I'm not completely sure if filename matters, but all the existing ones in there have a `.list' extension, so keep to that) for your favourite mirror. It would just contain a single line...

I need to point out that I am NOT a Debian user and every time I need to do anything with apt-* or dpkg, I have to google how to do it first.

OK, once you have added your mirror to the list you need to update the apt database. Pretty sure that is:

At this point you can pretty much install whatever you like via apt-get. However, I've seen funky **** that scares me (I did a "dry-run" on an apt-get run and it suggested that a gazillion packages that were currently installed weren't needed and you should auto-remove em. Erm, no I don't want!!)

The best thing I can suggest to you is to google for apt/dpkg HOWTOs or cheat sheets. With that in hand you'll know more than me. LOL

I've decided to wait until after the big update coming from Nokia that we've heard about before I attempt to install libpurple, telepathy-{haze,butterfly} and friends.