Yes, I just did apt-get update/upgrade through USB, and qdialgps from repository does the same to me. However, when I reinstalled it from deb, it gives no segmentation fault at start. So try from deb.

The problem may come from the fact that headers of Qt, glib, etc don't know where to look for each other, so I have to either create symlinks (as I do in my MADDE) or include /usr/lib/glib-2.0/include /usr/include/glib-.0 /usr/include/QtCore and what-not (as I tried to, too).

It seems that the difference between MADDE and builder's scratchbox was such that builder didn't give an error, but the binary gives segmentation fault.

EDIT: Attaching the same file as in previous post.

Thanks for encouragement.