ExtUtils::ParseXS will compile XS code into C code by embedding the constructs
necessary to let C functions manipulate Perl values and creates the glue
necessary to let Perl access those functions. The compiler uses typemaps to
determine how to map C function parameters and variables to Perl values.

Th compiler will search for typemap files called typemap. It will use the
following search path to find default typemaps, with the rightmost typemap
taking precedence.