Hi, I'm not sure where your "problem" is. You are missing an error not getting one.

The solution is, I think, that Perl looks up the function names at run-time not at compile-time! The call to first_method() is compiled in but where/what this function exactly is is only interpreted at run-time, which isn't executed when using the -c switch.

Also your code is incomplete because you are missing a main file which uses this two modules:

#!/usr/bin/perl
use warnings;
use strict;

use Second;

Second::second_method();
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When I run this script I get the following error:

Inside second_method
Undefined subroutine &Second::first_method called at Second.pm line 11
+.
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But I figured out that you missed the following line in First.pm:

our @ISA = qw(Exporter);
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Otherwise nothing will be exported.