[Koha] Perl Modules message at installation

[Krsnendu dasa]

When I run perl installer.pl
I get this message. Do I have to do anything about this?
 PERL MODULES

Checking perl modules ...
Subroutine PDF::API2::Resource::Font::Postscript::O_RDONLY redefined
at /usr/lib/perl5/5.8.8/Exporter.pm line 65.
 at /usr/lib/perl5/site_perl/5.8.8/PDF/API2/Resource/Font/Postscript.pm line 46

It also tells me I have to install gd::barcode but it is already installed.