This pngenc issue is bugging me I was wondering whether anybody could run these two lines in Xterminal (especially you folks facing problems with pngenc) and PM me/upload the output:

Note: The output for the second command might be quite long, it would be better to put it into a text file and upload it here, rather than copy/pasting it straight.

I can compare which packages are missing from your N900 as compared to mine so that I can zero in on which one contains pngenc.

Feel free to participate.. or not

P.S. I'm sure there's a better way to do this using the SDKs, but I'm not sure what it is yet