Here's a quick guide.

1. Install the SDK:

http://www.forum.nokia.com/Tools_Doc...atforms/Maemo/

2. Read up on debian source packages:

http://www.debian.org/doc/manuals/ap...ndling.en.html

3. Add a source repository to your /etc/apt/sources.list (within the SDK) that has the package you want to port.

4. sb-conf select FREMANTLE_ARMEL

5. apt-get source <packagename>

6. cd <packagedir>

7. dpkg-buildpackage -rfakeroot -b

8. Copy the resulting .deb file to your N900 and install with 'dpkg -i'