segmentation-fault when calling 'Mk_Variable()'

[Dietmar Dreyer]

Hi,
I tried to interface C with Prolog and wanted to create a Prolog-Variable
mit a call to 'Mk_Variable()', but I always get a segmentation-fault, even
if I just call this function without any assignment .
For instance:

PlTerm args[2];
args[0] = Mk_Variable();

or just:
Mk_Variable();

Can anyone give me a hint on how to fix this problem?