My machine is 64 bit, but does it think it is 32 bit?

Hi Aurora group!

I've just recently downloaded Aurora and installed it on some old Sun
Ultra 10's at my school in the hopes of making them into a cluster.
The program I want to compile and run is called GAMESS, which is a
quantum chemistry program that can run in parallel.  Because there is
no pre-compiled version for SPARC, I am building it from source.  In
the configuration process, I have to choose several options based on
the operating system of the computer.  My first instinct was to choose
"64 bit linux" since the Ultra 10 is a 64 bit machine, but as I was
reading around online about other SPARC linux ports, I realized that
perhaps some applications are running in 32 mode.  GAMESS is mostly
fortran with a tiny bit of C, and I am compiling it from the command
line.  Should I choose the 64 bit options, or the 32 bit option?

Thanks very much,
Stephen
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