I'm trying to come up with a way to automatically have the system
compile the programs that need it with support for large files (> 2.0
GB).  (I.E. Whoever compiles it does not HAVE to know it needs large
file support.)  On my V5R2M0 machine it seems to be enough to have a
'#define __IFS64_IO__' in the code.  (Per the manual)  However, we
develop on a V4R5M0 version machine to ensure compatibility with clients
who are not up to date on their OS release.  It appears that the above
define does not work the same, and I MUST specify the
SYSIFCOPT(*IFS64IO) option on the compile command.  

Does this sound about right?  Is there something else I need to do on


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