Bug 183002

Handbook chapter  "6.5.3. Anti-Aliased Fonts" have this indication:

"Certain fonts, such as Helvetica, may have a problem when anti-aliased. Usually this manifests itself as a font that seems cut in half vertically. At worst, it may cause applications to crash. To avoid this, consider adding the following to local.conf:
<match target="pattern" name="family"> 
  <test qual="any" name="family"> 
    <string>Helvetica</string> 
  </test> 
  <edit name="family" mode="assign"> 
    <string>sans-serif</string> 
  </edit> 
</match> "

Then I've create this local.conf file:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
         <match target="pattern" name="family">
         <test qual="any" name="family">
         <string>Helvetica</string>
         </test>
         <edit name="family" mode="assign">
         <string>sans-serif</string>
         </edit>
     </match>
</fontconfig>


But now I've got lot's of warning when I start xorg softwares:

Fontconfig error: "local.conf", line 11: invalid attribute 'name'

Fix: 

Just replace this line:
<match target="pattern" name="family">
by this one:
<match target="pattern">

fix the warning messsage.

I beleive all "match target" line of this chapter should be updated too.