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signbit


Dear Sirs:

I am a biology researcher working in University.
I am compiling one calculation program.  I had a trouble for compiling on
MacOSX (10.3.9) with gcc 3.3.

Error massage is following.
"BFunction.cc:615: error: `signbit' undeclared (first use this function)"

How can I overcome this?   I cannot compile because gcc 3.3 is not included
signbit function?

Koh-ichiro YOSHIURA



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