in reply to Prototype problem for XS module

The perlxs manual says that prototypes can be enabled and disabled but I find no guidance for how to use a predefined C prototype

What is "predefined C prototype"?

http://perldoc.perl.org/perlxs.html#The-PROTOTYPES%3a-Keyword is talking about sub iTakeOneScalar($){..]

In Section Seekers of Perl Wisdom