Can't locate WWW/Mechanize.pm in #INC - perl

Question

I am trying to get this sample code that I found on a site to work:
#!/usr/bin/perl
use v5.10;
use WWW::Mechanize;
use WWW::Mechanize::TreeBuilder;
my $mech = WWW::Mechanize->new;
WWW::Mechanize::TreeBuilder->meta->apply($mech);
$mech->get( 'http://htmlparsing.com/' );
# Find all <h1> tags
my #list = $mech->find('h1');
# or this way
# Now just iterate and process
foreach (#list) {
say $_->as_text();
}
When I run it I get this message:
Can't locate WWW/Mechanize.pm in #INC (#INC contains: /Library/Perl/5.16/darwin-thread-multi-2level /Library/Perl/5.16 /Network/Library/Perl/5.16/darwin-thread-multi-2level /Network/Library/Perl/5.16 /Library/Perl/Updates/5.16.2 /System/Library/Perl/5.16/darwin-thread-multi-2level /System/Library/Perl/5.16 /System/Library/Perl/Extras/5.16/darwin-thread-multi-2level /System/Library/Perl/Extras/5.16 .) at test2.pl line 4.
BEGIN failed--compilation aborted at test2.pl line 4.
Does anyone have any ideas on what is happening?

Answer 1

WWW::Mechanize is a Perl module. You need to install it. The easiest way is to run cpanm:
cpanm WWW::Mechanize
Note that your code says use WWW::Mechanize::TreeBuilder, which means you need to install that library as well. As its name suggests, it depends on WWW::Mechanize, which will be automatically installed if you run
cpanm WWW::Mechanize::TreeBuilder