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+====== GTK+ 3 preparation and optional compile support ======
+===== Default to GTK+ 2 in 4.12 =====
+Porting the entire desktop to GTK+ 3 is not going to happen in Xfce 4.12, it will be a more subtle approach. Xfce 4.12 has the following targets:
+  * Core needs to be GSEAL complaint.
+    * xfce4-dev-tools will enable -DGSEAL_ENABLE when compiling with full debugging.
+  * Stop using custom and deprecated widgets.
+    * xfce4-dev-tools will enable -DGTK_DISABLE_DEPRECATED when compiling with full debugging.
+===== Partly support GTK+ 3 =====
+Eventually Xfce has to work with to GTK+ 3, so we can optionally support this in a couple of applications to make the migration quicker and it becomes easier to track the status of GTK+ 3. This involves the following tasks:
+  * Allow building parallel GTK+ 2 and 3 libraries for libxfce4ui and exo.
+  * Core components can optionally compile against GTK+ 3 for testing.
+Depending on the time we'll see how this goes, but it give everybody the opportunity to work on this during the 4.12 release cycle. Keep in mind that GTK+ 2 is still the target for Xfce 4.12, so this should work at all times.

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