--- a/doc/Doxyfile.in	2009-07-13 16:30:48.000000000 -0400
+++ b/doc/Doxyfile.in	2019-02-08 13:22:51.088064431 -0500
@@ -46,6 +46,8 @@
 DISTRIBUTE_GROUP_DOC   = NO
 SUBGROUPING            = YES
 TYPEDEF_HIDES_STRUCT   = NO
+EXTENSION_MAPPING      = no_extension=C++
+
 #---------------------------------------------------------------------------
 # Build related configuration options
 #---------------------------------------------------------------------------
@@ -75,7 +77,6 @@
 ENABLED_SECTIONS       =
 MAX_INITIALIZER_LINES  = 30
 SHOW_USED_FILES        = YES
-SHOW_DIRECTORIES       = NO
 SHOW_FILES             = YES
 SHOW_NAMESPACES        = YES
 FILE_VERSION_FILTER    =
@@ -182,7 +183,6 @@
 HTML_HEADER            =
 HTML_FOOTER            =
 HTML_STYLESHEET        =
-HTML_ALIGN_MEMBERS     = YES
 GENERATE_HTMLHELP      = NO
 GENERATE_DOCSET        = NO
 DOCSET_FEEDNAME        = "Doxygen generated docs"
@@ -235,8 +235,6 @@
 #---------------------------------------------------------------------------
 GENERATE_XML           = YES
 XML_OUTPUT             = xml
-XML_SCHEMA             =
-XML_DTD                =
 XML_PROGRAMLISTING     = YES
 #---------------------------------------------------------------------------
 # configuration options for the AutoGen Definitions output
@@ -276,7 +274,7 @@
 MSCGEN_PATH            =
 HIDE_UNDOC_RELATIONS   = YES
 HAVE_DOT               = NO
-DOT_FONTNAME           = FreeSans
+DOT_FONTNAME           = Helvetica
 DOT_FONTPATH           =
 CLASS_GRAPH            = YES
 COLLABORATION_GRAPH    = YES