I am getting something like this except when configuring the web interface running the make-webconf it gives me a "No rule to make target install-webconf Stop"
I am using OpenSuse 11 with nagios 3.0.3
Did you install it from RPM or from source. Iwould suggest to install it from source, because some of differences in the paths.
Try this: novell.com/coolsolutions/feature/16723.html
Anyhow, reinstalling Nagios would probably help. Good luck.
What do you mean with reinstalling it? i copied the tar file on the linux system and untared it. Then i followed the instructions in the pdf file until the problem occured.