Ah, that was usefull =)
EDIT: this however comes from bin/get_plat_tag.sh which has a line that looks for a /etc/redhat-release file.
In that it looks for
*lol* yet another time that hack failed.
I really wonder why Zimbra folks doing such strange installer script, which pushes in the packages
on that low level, instead of just setting up proper repositories for the individual target distros.
That's pretty trivial.