diff --git a/src/unix/displayx11.cpp b/src/unix/displayx11.cpp
index c8a9605538..fdb3ae6399 100644
--- a/src/unix/displayx11.cpp
+++ b/src/unix/displayx11.cpp
@@ -159,7 +159,58 @@ wxDisplayImpl *wxDisplayFactoryX11::CreateDisplay(unsigned n)
 
     return n < screens.GetCount() ? new wxDisplayImplX11(n, screens[n]) : NULL;
 }
-#endif // !__WXGTK20__
+#else // __WXGTK20__
+
+// Provide stubs for the functions which were (wrongly!) part of ABI in 3.0.0.
+// They should never be actually used by anybody, but still keep them present,
+// just to be certain we don't prevent some programs referencing, but not
+// using, them from running with later 3.0.x versions.
+class WXDLLEXPORT wxDisplayImplX11 : public wxDisplayImpl
+{
+public:
+    wxDisplayImplX11(unsigned n) : wxDisplayImpl(n) { }
+
+    // These are inline because they were inline in 3.0.0 too.
+    virtual wxRect GetGeometry() const { return wxRect(); }
+    virtual wxRect GetClientArea() const { return wxRect(); }
+    virtual wxString GetName() const { return wxString(); }
+
+    // And those were not.
+    virtual wxArrayVideoModes GetModes(const wxVideoMode& mode) const;
+    virtual wxVideoMode GetCurrentMode() const;
+    virtual bool ChangeMode(const wxVideoMode& mode);
+
+private:
+    // We must also have the same data fields as in 3.0.0, even if they are
+    // unused, to avoid ABI checker warnings.
+    wxRect m_rect;
+    int m_depth;
+};
+
+wxArrayVideoModes
+wxDisplayImplX11::GetModes(const wxVideoMode& WXUNUSED(mode)) const
+{
+    return wxArrayVideoModes();
+}
+
+wxVideoMode wxDisplayImplX11::GetCurrentMode() const
+{
+    return wxVideoMode();
+}
+
+bool wxDisplayImplX11::ChangeMode(const wxVideoMode& WXUNUSED(mode))
+{
+    return false;
+}
+
+// We need to reference this class, otherwise our stubs will be simply
+// discarded. Notice that this function just needs to exist, not be called.
+extern wxDisplayImpl* wxDisplayImplX11Use(unsigned n)
+{
+    return new wxDisplayImplX11(n);
+}
+
+#endif // !__WXGTK20__/__WXGTK20__
 
 // ============================================================================
 // wxDisplayImplX11 implementation