Hi Marco...
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I'm also a newbie with Postgres....
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I tried compiling postgres on SCO Unixware with no luck. There's nothing in
any docs I found to suggest that anyone has done this. However, for your
OS/2 client problem, you might try the EMX suite of tools. I used them years
ago in my OS/2 days to compile unix stuff with some success. I can only
imagine they've gotten better since then.
Cheers,
Sean