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use lib 'path/to/the/modules';
# The example module could be path/to/the/modules/NameOfTheProject/Som
+eModule.pm

use strict;
package NameOfTheProject::SomeModule;
...
}

1;

use NameOfTheProject::SomeModule;

print NameOfTheProject::SomeModule::some_function();  # prints 123

use base 'Exporter';
our @EXPORT_OK = ('some_function');

use NameOfTheProject::SomeModule ('some_function');

print some_function();  # prints 123

# This is config.pl
mirror     => 'http://www.nl.example.com/mirror',
path       => '/var/www/example',
skip_files => [ 'png', 'gif', 'jpg' ],

# This is script.pl
use strict;
...
chdir $config{path};

...

use strict;
package Acme::Include;
...
}

1;

# This is foo.pl
use strict;
...
include 'bar.pl';

print $lexical;  # Should print: set in bar.pl

# This is bar.pl
use strict;
...

# There is no "my" here, because that would create a *new* lexical
# variable, hiding the existing one.