That's not good. Are you sure you ran this *within the Sage shell*?
I tried building conversion.i on a similar system, but was unable to
reproduce the problem. It might be really a problem with GCC, or it
might be a problem with your system, I cannot tell. Is there any chance
that I can get access to that system? Otherwise there is not much more
I can do.
It must be said that conversion.i takes a *very* long time to compile,
15 minutes on the system I tried. But eventually it succeeded.