diff --git a/SpatialMath.hs b/SpatialMath.hs
--- a/SpatialMath.hs
+++ b/SpatialMath.hs
@@ -1,7 +1,10 @@
 {-# OPTIONS_GHC -Wall #-}
 {-# Language StandaloneDeriving #-}
 {-# Language DeriveDataTypeable #-}
+{-# LANGUAGE CPP #-}
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 702
 {-# Language DeriveGeneric #-}
+#endif
 {-# Language DeriveFunctor #-}
 {-# Language DeriveFoldable #-}
 {-# Language DeriveTraversable #-}
@@ -34,7 +37,12 @@
 import Data.Foldable ( Foldable )
 import Data.Traversable ( Traversable )
 import Data.Typeable ( Typeable1 )
-import GHC.Generics ( Generic, Generic1 )
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 702
+import GHC.Generics (Generic)
+#endif
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 706
+import GHC.Generics (Generic1)
+#endif
 import Linear
 
 normalize' :: Floating a => Quaternion a -> Quaternion a
@@ -49,7 +57,14 @@
 data Euler a = Euler { eYaw :: a
                      , ePitch :: a
                      , eRoll :: a
-                     } deriving (Eq, Show, Generic, Generic1, Functor, Foldable, Traversable, Ord)
+                     } deriving (Eq, Show, Functor, Foldable, Traversable, Ord
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 702
+                                , Generic
+#endif
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 706
+                                , Generic1
+#endif
+                                )
 
 deriving instance Typeable1 Euler
 deriving instance Data a => Data (Euler a)
diff --git a/spatial-math.cabal b/spatial-math.cabal
--- a/spatial-math.cabal
+++ b/spatial-math.cabal
@@ -1,5 +1,5 @@
 name:                spatial-math
-version:             0.2.0
+version:             0.2.0.1
 synopsis:            3d math including quaternions/euler angles/dcms and utility functions
 description:         This is a port of my 'mathlib' C library: `https://github.com/ghorn/mathlib`
 license:             BSD3
@@ -17,6 +17,7 @@
 library
   exposed-modules:     SpatialMath
   build-depends:       base >= 4 && < 5,
+                       ghc-prim,
                        linear >= 1.3.1
   default-language:    Haskell2010