That was a great idea. I wonder that I didn't hit on it myself.

So the problem I found out was:
on AIX we have an old bigint module. I've read that it is globally tunred on and can't be turned off by no use bigint. But I thought that this doesn't count also for all files which are included.
So the trick was to put the use bigint behind my "use modules"...

Thank you so much ig and also all other monks in this glory monastery...

cu mck