[Koha] Install on Mac OS X

I have tried installing Koha -but keep on getting the same error - even after downloading the perl files and installing them. Has anyone any ideas how I might get around this? Thanks You are missing some Perl modules required by Koha. Please run this again after installing them. They may be installed by finding packages from your operating system supplier, or running (as root) the following commands: perl -MCPAN -e 'install "ZOOM"' perl -MCPAN -e 'install "You will need PDF::Reuse::Barcode for the new barcode generator"' perl -MCPAN -e 'install "You will need Net::LDAP if you want to authentify patrons through a LDAP"'