So I thought I would give SFLPhone a try, as I would like a softphone IAX2 client on my N900. It didn't install because of broken dependencies, and then I saw this page which claimed to address this problem.

So I installed successfully following those instructions, but SFLPhone didn't really work very well (I could connect numbers, but not hear the other party). So I decided to uninstall.

I used dpkg -P to get rid of the two main packages. But all the dependencies I installed manually are still on the phone, and taking up about 9MB of precious rootfs space. The are all listed on that page, but I don't want to uninstall each one manually, as I remembered that during the install some of them were already installed and therefore needed. I don't want to break anything. apt-get -autoremove doesn't help here. What to do?

Stay away from dpkg, it does know near nothing about the dependency tree, use apt-get instead!!!

It will ask if you really want to proceed if more than the listed packages in the command would get removed. You could then interrupt the removal, if critical stuff is listed to get removed. Read the output with special care.