--- ./configure.ac.orig	2019-03-10 13:06:41.459005634 -0500
+++ ./configure.ac	2019-03-10 13:11:12.155008532 -0500
@@ -158,8 +158,11 @@
 
 AC_ARG_ENABLE(valadoc, AS_HELP_STRING([--disable-valadoc], [Disable valadoc]), enable_valadoc=$enableval, enable_valadoc=yes)
 if test x$enable_valadoc = xyes; then
+AC_ARG_ENABLE(graphviz, AS_HELP_STRING([--disable-graphviz], [Disable graphviz usage for valadoc]), enable_graphviz=$enableval, enable_graphviz=yes)
+if test x$enable_graphviz = xyes; then
 	PKG_CHECK_MODULES(LIBGVC, libgvc >= $LIBGVC_REQUIRED)
 	AC_MSG_CHECKING([for CGRAPH])
+	VALAFLAGS="$VALAFLAGS -D HAVE_GRAPHVIZ"
 	cgraph_tmp_LIBADD="$LIBADD"
 	cgraph_tmp_CFLAGS="$CFLAGS"
 	LIBADD="$LIBADD $LIBGVC_LIBS"
@@ -186,6 +189,8 @@
 	LIBADD="$cgraph_tmp_LIBADD"
 	CFLAGS="$cgraph_tmp_CFLAGS"
 fi
+AM_CONDITIONAL(ENABLE_GRAPHVIZ, test x$enable_graphviz = xyes)
+fi
 AM_CONDITIONAL(HAVE_CGRAPH, test "$have_cgraph" = "yes")
 AM_CONDITIONAL(ENABLE_VALADOC, test x$enable_valadoc = xyes)
 
--- ./libvaladoc/html/basicdoclet.vala.orig	2019-03-07 06:45:45.000000000 -0600
+++ ./libvaladoc/html/basicdoclet.vala	2019-03-10 13:06:41.513005635 -0500
@@ -46,7 +46,11 @@
 	protected HtmlRenderer _renderer;
 	protected Html.MarkupWriter writer;
 	protected Html.CssClassResolver cssresolver;
+#if HAVE_GRAPHVIZ
 	protected Charts.Factory image_factory;
+#else
+	protected void* image_factory;
+#endif
 	protected ErrorReporter reporter;
 	protected string package_list_link = "../index.html";
 
@@ -120,7 +124,9 @@
 		this.linker = new LinkHelper ();
 
 		_renderer = new HtmlRenderer (settings, this.linker, this.cssresolver);
+#if HAVE_GRAPHVIZ
 		this.image_factory = new SimpleChartFactory (settings, linker);
+#endif
 	}
 
 
@@ -1025,6 +1031,7 @@
 	}
 
 	protected void write_image_block (Api.Node element) {
+#if HAVE_GRAPHVIZ
 		if (element is Class || element is Interface || element is Struct) {
 			unowned string format = (settings.use_svg_images ? "svg" : "png");
 			var chart = new Charts.Hierarchy (image_factory, element);
@@ -1044,6 +1051,7 @@
 									   this.get_img_path_html (element, format)});
 			writer.add_usemap (chart);
 		}
+#endif
 	}
 
 	public void write_namespace_content (Namespace node, Api.Node? parent) {
--- ./libvaladoc/html/htmlmarkupwriter.vala.orig	2019-03-07 06:45:45.000000000 -0600
+++ ./libvaladoc/html/htmlmarkupwriter.vala	2019-03-10 13:06:41.528005635 -0500
@@ -51,12 +51,16 @@
 		}
 	}
 
+#if HAVE_GRAPHVIZ
 	public unowned MarkupWriter add_usemap (Charts.Chart chart) {
 		string? buf = (string?) chart.write_buffer ("cmapx");
 		if (buf != null) {
 			raw_text ("\n");
 			raw_text ((!) buf);
 		}
+#else
+	public unowned MarkupWriter add_usemap (void* chart) {
+#endif
 
 		return this;
 	}
--- ./libvaladoc/Makefile.am.orig	2019-03-07 08:55:35.000000000 -0600
+++ ./libvaladoc/Makefile.am	2019-03-10 13:06:41.509005635 -0500
@@ -119,10 +119,6 @@
 	content/tablerow.vala \
 	content/taglet.vala \
 	content/text.vala \
-	charts/chart.vala \
-	charts/chartfactory.vala \
-	charts/hierarchychart.vala \
-	charts/simplechartfactory.vala \
 	parser/manyrule.vala \
 	parser/oneofrule.vala \
 	parser/optionalrule.vala \
@@ -149,13 +145,24 @@
 	highlighter/codetoken.vala \
 	highlighter/highlighter.vala \
 	html/basicdoclet.vala \
-	html/htmlchartfactory.vala \
 	html/linkhelper.vala \
 	html/cssclassresolver.vala \
 	html/htmlmarkupwriter.vala \
 	html/htmlrenderer.vala \
 	$(NULL)
 
+if ENABLE_GRAPHVIZ
+libvaladoc_la_VALASOURCES += \
+	charts/chart.vala \
+	charts/chartfactory.vala \
+	charts/hierarchychart.vala \
+	charts/simplechartfactory.vala \
+	html/htmlchartfactory.vala \
+	$(NULL)
+
+LIBGVC_PKG = --vapidir $(top_srcdir)/vapi --pkg libgvc
+endif
+
 libvaladoc@PACKAGE_SUFFIX@_la_SOURCES = \
 	libvaladoc.vala.stamp \
 	$(libvaladoc_la_VALASOURCES:.vala=.c) \
@@ -175,11 +182,11 @@
 		--library valadoc \
 		--vapi valadoc@PACKAGE_SUFFIX@.vapi \
 		--vapidir $(top_srcdir)/vapi --pkg gmodule-2.0 \
-		--vapidir $(top_srcdir)/vapi --pkg libgvc \
 		--vapidir $(top_srcdir)/gee --pkg gee \
 		--vapidir $(top_srcdir)/vala --pkg vala \
 		--vapidir $(top_srcdir)/ccode --pkg ccode \
 		--vapidir $(top_srcdir)/codegen --pkg codegen \
+		$(LIBGVC_PKG) \
 		--pkg config \
 		$(filter %.vala %.c,$^)
 	touch $@
@@ -207,6 +214,9 @@
 
 valadoc@PACKAGE_SUFFIX@.pc: valadoc.pc
 	cp $< $@
+if !ENABLE_GRAPHVIZ
+	sed -i "s/libgvc //g" $@
+endif
 
 vapidir = $(datadir)/vala/vapi
 dist_vapi_DATA = valadoc@PACKAGE_SUFFIX@.vapi
@@ -214,6 +224,9 @@
 
 valadoc@PACKAGE_SUFFIX@.deps: valadoc.deps
 	cp $< $@
+if !ENABLE_GRAPHVIZ
+	sed -i "s/libgvc//g" $@
+endif
 
 EXTRA_DIST = \
 	$(libvaladoc_la_VALASOURCES) \