PS by "disabled" I mean at ./configure time,
````
$ ./configure --help | egrep dox
  --disable-doxygen-doc   don't generate any doxygen documentation
  --disable-doxygen-dot   don't generate graphics for doxygen documentation
  --disable-doxygen-man   don't generate doxygen manual pages
  --enable-doxygen-rtf    generate doxygen RTF documentation
  --enable-doxygen-xml    generate doxygen XML documentation
  --enable-doxygen-chm    generate doxygen compressed HTML help documentation
  --enable-doxygen-chi    generate doxygen seperate compressed HTML help index
  --disable-doxygen-html  don't generate doxygen plain HTML documentation
  --enable-doxygen-ps     generate doxygen PostScript documentation
  --disable-doxygen-pdf   don't generate doxygen PDF documentation
````