I believe the attached patch is closer to the "right" fix.
Presumably, packages actually requiring the dot command will have an
override for this variable in their Doxyfiles.
Thanks.
--- a/src/config.xml
+++ b/src/config.xml
@@ -3104,7 +3104,7 @@ where `loc1` and `loc2` can be relative or absolute paths
or URLs.
</option>
</group>
<group name='Dot' docs='Configuration options related to the dot tool'>
- <option type='bool' id='CLASS_DIAGRAMS' defval='1'>
+ <option type='bool' id='CLASS_DIAGRAMS' defval='0'>
<docs>
<![CDATA[
If the \c CLASS_DIAGRAMS tag is set to \c YES, doxygen will