There's a bug in fvwm95-2.0.43a, which causes the window manager
to crash when one tries to iconize a window for wich no icon-name
was registered.

The patch enclosed in fvwm95-2.0.43a.patch fixes the problem.

To apply it, cd to the fvwm95-2.0.43a-Whatever/fvwm directory,
then enter the command:

  patch < fvwm95-2.0.43a.patch