None of the (C/C++) IDE I've tried so far appear to work in a usefull way,
Gnome's Anjuta crashes to the desktop when I add a file to a (console app)
project, Code::Blocks crashes to the desktop when creating a project
(both under Gnome and XFCE) and Kdevelop can't open, or build, it's
projects.

Any sugestions where to look for the cause of these crashes, logfiles,
special (installation) instructions?

It is a recently installed FreeBSD 7 on a Duron @1350, 256 MB, ~14Gb
SCSI-3 partition. Gnome, KDE (+KDevelop) and XFCE from packages, Anjuta
and Code::Blocks from ports.