Hi I have built a development system on Ubuntu 14.04 according to https://wiki.koha-community.org/wiki/Koha_on_ubuntu_-_git At the end koha_perl_deps.pl shows me three required Perlmodules (Exception::Class, Sereal::Decoder, Sereal::Encoder) that are not yet installed in the required version. Of course, easiest would be to install them via Debian packets - libexception-class-perl, libsereal-decoder-perl, libsereal-encoder-perl do exist but they don't contain the required versions. I went through the Koha wiki and found at least four different ways to install such missing Perl modules on Debian/Ubuntu. 1. Installation from CPAN using dh-make-perl, resulting in a command like dh-make-perl –install –cpan Foo::Bar 2. It seems also possible to download the source of the Perl module, then use dh-make-perl to create a Debian package that can be installed using dpkg dpkg -i Foo-Bar 2. Installation from CPAN cpan Foo::Bar 3. Installation from CPAN via perl perl -MCPAN -e 'shell' install Foo::Bar 4. Installation from CPAN using CPANMinus cpanm --local-lib /var/koha/koha-perl Foo::Bar Now my question: What is the best way to install missing Perl modules on a development system? And is there a difference if I need to install missing Perl modules on a productive system? Kind regards, Michael -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch