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  28  <H2><A NAME="3_2">3.2 Customizing the installation</A></H2>
  29  <P> In order for JpGraph to work it is necessary to adjust the cache and
  30   TTF directory to suit the specific installation. By default the TTF
  31   directory is &quot;/usr/X11R6/lib/X11/fonts/truetype/&quot; and for the cache
  32   &quot;/tmp/jpgraph_cache/&quot;. These are defined as PHP defines at the top of<I>
  33   jpg-config.inc.php</I></P>
  34  <P> Please make sure that PHP has write permissions to the cache
  35   directory if the cache feature should be used. If this is not the case
  36   a &quot;Can't write file xxx.yyy&quot; error will occur when a graph that uses
  37   the cache feature are generate. More information regarding the cache
  38   feature of JpGraph is available in the section<I> Making sense of
  39   caching system in JpGraph</I></P>
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