The WebKit code conditionally calls getRootCoords() when the Gtk
version is old (i.e < 2.17.3), but fails to declare the prototype of
this function (which is implemented after its call site). This build
failure has probably been missed due to the fact that not many people
try to compile recent WebKit versions with old Gtk.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: webkit-1.2.3/WebKitTools/DumpRenderTree/gtk/EventSender.cpp
===================================================================
--- webkit-1.2.3.orig/WebKitTools/DumpRenderTree/gtk/EventSender.cpp	2010-07-19 20:42:27.000000000 +0200
+++ webkit-1.2.3/WebKitTools/DumpRenderTree/gtk/EventSender.cpp	2010-07-19 20:42:57.000000000 +0200
@@ -86,6 +86,9 @@
 static void sendOrQueueEvent(GdkEvent event);
 static void dispatchEvent(GdkEvent event);
 static guint getStateFlags();
+#if !GTK_CHECK_VERSION(2,17,3)
+static void getRootCoords(GtkWidget* view, int* rootX, int* rootY);
+#endif
 
 static JSValueRef getDragModeCallback(JSContextRef context, JSObjectRef object, JSStringRef propertyName, JSValueRef* exception)
 {