http://qs321.pair.com?node_id=111702

Q&A > math > How can I import previously created math functions? - Answer contributed by ariels

The amazing Inline module offers help here, too. Not all <math.h> functions are available in Perl (even if you use POSIX;).

Here's how to print some erf() values, for instance (a function almost certainly available in your maths library):

perl -le 'use Inline C => q{ double erf(double); }, ENABLE => "AUTOWRA +P"; print "$_ ",erf($_) for (0..5)'

You can of course write it into your modules, and use it to access you own libraries.

Other C wrapping options are XS (of course) and Swig.