diff -up exiv2-trunk/config/Doxyfile.doxygen exiv2-trunk/config/Doxyfile
--- exiv2-trunk/config/Doxyfile.doxygen	2017-05-02 09:17:33.631909015 -0500
+++ exiv2-trunk/config/Doxyfile	2017-05-02 09:18:03.019200824 -0500
@@ -1688,7 +1688,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # toolkit from AT&T and Lucent Bell Labs. The other options in this section
 # have no effect if this option is set to NO (the default)
 
-HAVE_DOT               = YES
+#HAVE_DOT               = YES
 
 # The DOT_NUM_THREADS specifies the number of dot invocations doxygen is
 # allowed to run in parallel. When set to 0 (the default) doxygen will
@@ -1705,7 +1705,7 @@ DOT_NUM_THREADS        = 0
 # the DOTFONTPATH environment variable or by setting DOT_FONTPATH to the
 # directory containing the font.
 
-DOT_FONTNAME           = Arial
+#DOT_FONTNAME           = Arial
 
 # The DOT_FONTSIZE tag can be used to set the size of the font of dot graphs.
 # The default size is 10pt.