diff --git a/gio.cabal b/gio.cabal
--- a/gio.cabal
+++ b/gio.cabal
@@ -1,5 +1,5 @@
 Name:           gio
-Version:        0.13.6.0
+Version:        0.13.6.1
 License:        LGPL-2.1
 License-file:   COPYING
 Copyright:      (c) 2001-2010 The Gtk2Hs Team
@@ -40,7 +40,7 @@
 
 custom-setup
   setup-depends: base >= 4.6,
-                 Cabal >= 1.24 && < 2.5,
+                 Cabal >= 1.24 && < 3.1,
                  gtk2hs-buildtools >= 0.13.2.0 && < 0.14
 
 Library
@@ -80,10 +80,10 @@
 
         default-language:   Haskell98
         default-extensions: ForeignFunctionInterface
-		
-        cpp-options:    -U__BLOCKS__ -Ubool
+
+        cpp-options:    -U__BLOCKS__ -Ubool -D__attribute__(A)=
         if os(darwin) || os(freebsd)
-          cpp-options: -D__attribute__(A)= -D_Nullable= -D_Nonnull= -D_Noreturn=
+          cpp-options: -D_Nullable= -D_Nonnull= -D_Noreturn=
 
         x-Signals-File:  System/GIO/Signals.chs
         x-Signals-Modname: System.GIO.Signals