writing to stderr

Erick Alphonse <[email protected]>
Newsgroups gmane.comp.gnu.prolog.general
Message-ID <[email protected]>
Hello,

Do you know how to write to stderr within gprolog, please?

Also, I noticed that when you override the current output with 
set_output, stdout doesn't get affected in C code. Is it a bug?

Thanks in advance,
Erick.
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