diff --git a/computational-geometry.cabal b/computational-geometry.cabal
--- a/computational-geometry.cabal
+++ b/computational-geometry.cabal
@@ -1,5 +1,5 @@
 Name          : computational-geometry
-Version       : 0.1.0.2
+Version       : 0.1.0.3
 Synopsis      : Collection of algorithms in Computational Geometry.
 License       : BSD3
 License-File  : LICENSE
diff --git a/src/Geometry/Plane/General.hs b/src/Geometry/Plane/General.hs
--- a/src/Geometry/Plane/General.hs
+++ b/src/Geometry/Plane/General.hs
@@ -1,5 +1,6 @@
 {-# Language MultiParamTypeClasses #-}
 {-# Language FlexibleInstances #-}
+{-# Language FlexibleContexts #-}
 --------------------------------------------------------------------------------
 -- |
 -- Module     : Geometry.Plane.General
diff --git a/src/Geometry/SetOperations/BRep.hs b/src/Geometry/SetOperations/BRep.hs
--- a/src/Geometry/SetOperations/BRep.hs
+++ b/src/Geometry/SetOperations/BRep.hs
@@ -1,6 +1,7 @@
 {-# Language MultiParamTypeClasses #-}
 {-# Language TypeSynonymInstances #-}
 {-# Language FlexibleInstances #-}
+{-# Language FlexibleContexts #-}
 --------------------------------------------------------------------------------
 -- |
 -- Module     : Geometry.SetOperations.BRep