Please help. Illegal instruction (core dumped)

[s11]

When I tried to run the compiled program. It returned a message "Illegal 
instruction (core dumped)" .
I debugged the program, and found that it appears because this line:

    Signal = new OptSignal("Filename", &RN);

But I can successfully run the code under another machine.


Redhat linux 9.0
gcc version is 2.95.3 (I installed this version because the code can't be 
compile under 3.2.2)

another machine run the code well:
Redhat linux 7.2
egcs 1.1.2

Please help me about the problem. Thanks

Best regards,
Yang Sun