(copied from iMacG5 configuration) You need to create a new font configuration file. In the terminal:

{{{cd ~ nano -w .fonts.conf}}}

and add these lines. If you already have text in this file (because you have set up font-smoothing, for example) then you need to copy the lines inside the <fontconfig> tag, since the header and <fontconfig> tags already exist in your file

<?xml version="1.0"?> 
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">


<!-- Helvetica is a non true type font, and will look bad. This
replaces it with whatever is the default sans-serif font -->

<match target="pattern" name="family" >
<test name="family" qual="any" >
<edit mode="assign" name="family" >