diff --git a/gtk.cabal b/gtk.cabal
--- a/gtk.cabal
+++ b/gtk.cabal
@@ -1,5 +1,5 @@
 Name:           gtk
-Version:        0.15.4
+Version:        0.15.5
 License:        LGPL-2.1
 License-file:   COPYING
 Copyright:      (c) 2001-2010 The Gtk2Hs Team
@@ -135,7 +135,7 @@
 
 custom-setup
   setup-depends: base >= 4.6,
-                 Cabal >= 1.24 && < 3.1,
+                 Cabal >= 1.24 && < 3.3,
                  gtk2hs-buildtools >= 0.13.2.0 && < 0.14
 
 Library
@@ -383,7 +383,7 @@
         include-dirs:   .
         cpp-options: -U__BLOCKS__ -DGLIB_DISABLE_DEPRECATION_WARNINGS
         if os(darwin) || os(freebsd)
-          cpp-options: -D_Nullable= -D_Nonnull=
+          cpp-options: -D_Nullable= -D_Nonnull= -D__attribute__(x)=
         if !flag(deprecated)
           cpp-options:  -DDISABLE_DEPRECATED
         else