Executing programs from new workstations on old workstations

[Vogtberg Stefan]

I have started to use a GNU compiler version 2.95.3 for my C++ source on a
workstation (named 'snimi1' - see below) . The executable programs can be
started on this Sun but not on older workstations using SunOS 5.5.1 .
When I compile the same source using the same makefile with a GNU compiler
version 2.8.1 (on the 'snimi1-old' - see below) the executable programe can
be started on any workstation including the new one.
Which parameters will I have to change that the new Sun will produce
executable programms that can be used on older workstations?

Details of the two workstations (uname -a):
SunOS	snimi1-old	5.5.1	Generic		sun4m	sparc
SUNW,SPARCstation-20
SunOS	snimi1	5.8	Generic_108528-10 sun4u	sparc	SUNW,Sun-Fire-280R

Stefan Vogtberg
Institute for Medical Informatics, Statistics and Documentation
Graz, Austria