I have put togather a little patch for ispconfig to make it install in a gentoo environment.
There are a few things you need to know in order to use this patch.
1: The patch only support bind9 running in the default gentoo chroot environment. To setup this environment you need to install bind9 fresh and then run the ebuild config option as follows:
ebuild /var/db/pkg/net-dns/bind-9.2.2-r3/bind-9.2.5-r9.ebuild config
This will configure your bind install for chroot operation and setup the needed files in /chroot/dns/bind9.
2: The patch only currently supports apache-2.x (This can be changed with a little editor work
3: I choose only to support proftpd standalone. (I would give my right arm for pure-ftpd support, maybe later)
4: Only postfix is supported by the patch.
5: Only vixie-cron is currently supported.
You can find the patch Here
I have issues with installing ANYTHING at all in my /root directory so for those who feel as I do I have made a second copy of the patch that installs ISPConfig in /opt rather than /root this patch contains my gentoo additions along with the /opt patch so it may be safely used on any of the supported OSes, You can find that patch Here