> 
> Do you have glib2 installed? What version?

bash-3.1# pkg_info glib2
Information for glib2-2.10.2:

Comment:
Some useful routines for C programming (glib2)

<omitted>

> 
> Are you using USE_ABI_DEPENDS=no? (Do not use this.)
> 

Since gcalctool worked ok before, I guess not. In /etc no rc.* contains it.

> Did you do a "make clean" in pkgsrc/math/gcalctool first?
> 

Hmm..no. Just did it but I got the same problem.

Huub