The think is that some packages from debian.koha-community.org have code 
compiled for perl, so they depend on its version.

For example "libref-util-perl" installs module in :
/usr/lib/x86_64-linux-gnu/perl5/5.20/

But the perl is :
Debian 9 : 5.20
Debian 10 : 5.24
Ubuntu 18.04 : 5.22

I was wondering how we can provide a compatiblity in our packages.