Supported distributions supports a large variety of target platforms for your packages:

Distribution (64 bits only) Identifier init system
Ubuntu 16.04 Xenial ubuntu-16.04 systemd
Ubuntu 14.04 Trusty ubuntu-14.04 upstart
Ubuntu 12.04 Precise ubuntu-12.04 upstart
Debian 8 Jessie debian-8 systemd
Debian 7 Wheezy debian-7 sysvinit
CentOS/RHEL 7.x centos-7 systemd
CentOS/RHEL 6.x centos-6 upstart
Suse Linux Enterprise Server 12 sles-12 sysvinit
Suse Linux Enterprise Server 11 sles-11 sysvinit

Distributions can be enabled or disabled by configuring your targets in the .pkgr.yml file.