Compiling 5.005.03 on UnixWare, meaning of "undef"

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Migrated from rt.perl.org#945 (status was 'resolved')

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[p5pRT]

From brianm@ioconcepts.com

Hi! I am in the process of compiling Perl 5.005.03 on SCO UnixWare v7.0.1, and I have a question.

When 'Configure' comes up and it says​:
***WHOA THERE***
The recommended value for "$d_bcmp" on this machine was "undef".

What does this mean, and how can I tell it that bcmp is defined in strings.h?