How do I install Homebrew on Tiger? According to this previous question, I want to install Homebrew Tiger branch on my iBook running ... well, Tiger.
Unfortunatly, when running the Ruby one-liner,

ruby -e "$(curl -fsSL https://raw.github.com/gist/323731/39fc1416e34b9f6db201b4a026181f4ceb7cfa74)"


I always get the following error :

This script requires the user nicolas to be in the staff group. If this
sucks for you then you can install Homebrew in your home directory or
however
you please; please refer to the website. If you still want to use this 
script
the following command should work:

dscl /Local/Default -append /Groups/staff GroupMembership $USER


I have unsuccessfully tried to add myself as a member of the staff group.

What can I do to install Homebrew on my Tiger mac ?

Thanks

EDIT Yes, I have a version of XCode for my platform, it's a legacy 2.5 that I installed specifically for that purpose.

Concerning the Ruby script, a rapid overview of its code indicates that the error appears as invoking groups does not return the staff group.

And indeed, when I issue this command by hand, I get

$ groups
nicolas appserveradm appserverusr admin


So, how can I add myself to the staff group in a fashion that this command will understand ?
So, I finally managed to have a working version of homebrew, but it wasn't that simple.

First, download from sources and make install of Git following these instructions.

Then, using git, get the sceaga Tiger branch of Homebrew.

All should then work correctly (more or less).

EDIT There seems to be a tarball hidden somwhere that could be used with root installation procedure. It has the obvious interest of avoiding one to install git just for the sake of having a running homebrew to ... install another git version.