From 48c4ad800443db5ccec8f51376c375e4715677c5 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 28 May 2015 13:27:38 -0400
Subject: only use and present the buggy gradient parameter if built with a
 suitably patched version of Cairo

---
 gtk2_ardour/rc_option_editor.cc | 6 +++++-
 gtk2_ardour/ui_config.cc        | 5 ++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/gtk2_ardour/rc_option_editor.cc b/gtk2_ardour/rc_option_editor.cc
index 9efd73ed28..a12fa90f4c 100644
--- a/gtk2_ardour/rc_option_editor.cc
+++ b/gtk2_ardour/rc_option_editor.cc
@@ -21,6 +21,8 @@
 #include "gtk2ardour-config.h"
 #endif
 
+#include <cairo/cairo.h>
+
 #include <boost/algorithm/string.hpp>    
 
 #include <gtkmm/liststore.h>
@@ -2644,6 +2646,7 @@ RCOptionEditor::RCOptionEditor ()
 
 	/* INTERFACE */
 
+#ifdef CAIRO_SUPPORTS_FORCE_BUGGY_GRADIENTS_ENVIRONMENT_VARIABLE
 	BoolOption* bgo = new BoolOption (
 		"buggy-gradients",
 		_("Possibly improve slow graphical performance"),
@@ -2653,7 +2656,8 @@ RCOptionEditor::RCOptionEditor ()
 
 	Gtkmm2ext::UI::instance()->set_tip (bgo->tip_widget(), string_compose (_("This requires restarting %1 before having an effect"), PROGRAM_NAME));
 	add_option (S_("Preferences|GUI"), bgo);
-
+#endif
+	
 	add_option (S_("Preferences|GUI"),
 	     new BoolOption (
 		     "widget-prelight",
diff --git a/gtk2_ardour/ui_config.cc b/gtk2_ardour/ui_config.cc
index f34a5a48b6..1fe2d4135f 100644
--- a/gtk2_ardour/ui_config.cc
+++ b/gtk2_ardour/ui_config.cc
@@ -23,6 +23,8 @@
 #include <cstdlib>
 #include <cstdio> /* for snprintf, grrr */
 
+#include <cairo/cairo.h>
+
 #include <glibmm/miscutils.h>
 #include <glib/gstdio.h>
 
@@ -150,10 +152,11 @@ UIConfiguration::map_parameters (boost::function<void (std::string)>& functor)
 int
 UIConfiguration::pre_gui_init ()
 {
+#ifdef CAIRO_SUPPORTS_FORCE_BUGGY_GRADIENTS_ENVIRONMENT_VARIABLE
 	if (get_buggy_gradients()) {
 		g_setenv ("FORCE_BUGGY_GRADIENTS", "1", 1);
 	}
-
+#endif
 	return 0;
 }
 
-- 
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