Fix build with older GHC < 7.10

src/HSFM/GUI/Gtk/Errors.hs

@@ -16,6 +16,7 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 --}
 
+{-# LANGUAGE DeriveDataTypeable #-}
 {-# OPTIONS_HADDOCK ignore-exports #-}
 
 -- |Provides error handling for Gtk.

src/HSFM/GUI/Gtk/Icons.hs

@@ -22,6 +22,10 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 module HSFM.GUI.Gtk.Icons where
 
 
+import Control.Applicative
+  (
+    (<$>)
+  )
 import Data.Maybe
   (
     fromJust

src/HSFM/GUI/Gtk/Utils.hs

@@ -21,6 +21,10 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 module HSFM.GUI.Gtk.Utils where
 
 
+import Control.Applicative
+  (
+    (<$>)
+  )
 import Control.Concurrent.MVar
   (
     readMVar