--- old/modules/javafx.graphics/src/main/java/com/sun/glass/ui/gtk/GtkApplication.java	2016-11-22 19:10:35.178503276 +0300
+++ new/modules/javafx.graphics/src/main/java/com/sun/glass/ui/gtk/GtkApplication.java	2016-11-22 19:10:35.098503278 +0300
@@ -86,7 +86,7 @@
         return val;
     }
 
-    GtkApplication() {
+    GtkApplication(int forcedGtkVersion) {
 
         // Check whether the Display is valid and throw an exception if not.
         // We use UnsupportedOperationException rather than HeadlessException
@@ -95,17 +95,17 @@
             throw new UnsupportedOperationException("Unable to open DISPLAY");
         }
 
-        int gtkVersion =
-                AccessController.doPrivileged((PrivilegedAction<Integer>) () -> {
-            String v = System.getProperty("jdk.gtk.version","2");
-            int ret = 0;
-            if ("3".equals(v) || v.startsWith("3.")) {
-                ret = 3;
-            } else if ("2".equals(v) || v.startsWith("2.")) {
-                ret = 2;
-            }
-            return ret;
-        });
+        final int gtkVersion = forcedGtkVersion == 0 ?
+            AccessController.doPrivileged((PrivilegedAction<Integer>) () -> {
+                String v = System.getProperty("jdk.gtk.version","2");
+                int ret = 0;
+                if ("3".equals(v) || v.startsWith("3.")) {
+                    ret = 3;
+                } else if ("2".equals(v) || v.startsWith("2.")) {
+                    ret = 2;
+                }
+                return ret;
+            }) : forcedGtkVersion;
         boolean gtkVersionVerbose =
                 AccessController.doPrivileged((PrivilegedAction<Boolean>) () -> {
             return Boolean.getBoolean("jdk.gtk.verbose");