If I'm the Jon in question, it was sigc++ 2.0.11 with gcc 3.3

I've not tested with gcc 4.0.x

Someone else got it to work with autopackage. His base attempt with gcc 4.0.2 and sigc++ 2.0.10 failed, but the autopackage build that used sigc++ 2.0.16 worked on that same box.