From 8997d06397abd940ed61e6b61cfc46d891c860ff Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Wed, 27 Nov 2019 23:21:45 +0100
Subject: [PATCH] Fix build with GTK 3 < 3.20

Restore a check removed in d85794e87fc247d528708d8945e9d4015a72c534 as
it's still needed: AddTreeviewHeaderButton() is only defined for 3.20
or later.
---
 src/gtk/renderer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gtk/renderer.cpp b/src/gtk/renderer.cpp
index e2dddc134a..b35dfe381d 100644
--- a/src/gtk/renderer.cpp
+++ b/src/gtk/renderer.cpp
@@ -240,6 +240,8 @@ wxRendererGTK::DrawHeaderButton(wxWindow *win,
     if (cr == NULL)
         return 0;
 
+    // AddTreeviewHeaderButton() is only available in 3.20 or later.
+#if GTK_CHECK_VERSION(3,20,0)
     if (gtk_check_version(3,20,0) == NULL)
     {
         int pos = 1;
@@ -256,6 +258,7 @@ wxRendererGTK::DrawHeaderButton(wxWindow *win,
         gtk_render_frame(sc, cr, rect.x - x_diff, rect.y, rect.width, rect.height);
     }
     else
+#endif // GTK >= 3.20
     {
         GtkStyleContext* sc = gtk_widget_get_style_context(button);
         gtk_style_context_save(sc);