everybuddy 0.4.2 macos-X - help?

I'd like to be able to connect to both AIM and YIM from my Mac - 
right now I have to run two programs (iChat and YIM) - but it would 
certainly be nicer to be able to do it in one.

Everybuddy sounds like what I want - but I cannot figure out how to 
properly install/use it from my Mac (running MacOS-X 10.2.4)

I downloaded the .deb file from the web site, and ran dpkg --install 
on it, which installed 'everybuddy' into /sw/bin/

If I try to run it from the Terminal window it tells me:
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Using esd sound

Gtk-WARNING **: cannot open display:
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If I try to double-click on it from a Finder window - it tells me it 
doesn't know what application to use to run it.

Can anyone enlighten me on how to run this program?

--fish