8 files changed, 40 insertions, 1 deletions

diff --git a/packages/base/src/Internal/Container.hs b/packages/base/src/Internal/Container.hs
index b379530..1520489 100644
--- a/packages/base/src/Internal/Container.hs
+++ b/packages/base/src/Internal/Container.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -29,7 +30,9 @@ import Internal.Matrix
 import Internal.Element
 import Internal.Numeric
 import Internal.Algorithms(Field,linearSolveSVD,Herm,mTm)
-
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 ------------------------------------------------------------------
 
 {- | Creates a real vector containing a range of values:
diff --git a/packages/base/src/Internal/Convolution.hs b/packages/base/src/Internal/Convolution.hs
index 384fdf8..004e1ff 100644
--- a/packages/base/src/Internal/Convolution.hs
+++ b/packages/base/src/Internal/Convolution.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 -----------------------------------------------------------------------------
 {- |
@@ -23,6 +24,9 @@ import Internal.Numeric
 import Internal.Element
 import Internal.Conversion
 import Internal.Container
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 
 vectSS :: Element t => Int -> Vector t -> Matrix t
diff --git a/packages/base/src/Internal/Modular.hs b/packages/base/src/Internal/Modular.hs
index f3c59a8..9d51444 100644
--- a/packages/base/src/Internal/Modular.hs
+++ b/packages/base/src/Internal/Modular.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
@@ -38,13 +39,20 @@ import Internal.Util(Normed(..),Indexable(..),
                      gaussElim, gaussElim_1, gaussElim_2,
                      luST, luSolve', luPacked', magnit, invershur)
 import Internal.ST(mutable)
+#if MIN_VERSION_base(4,11,0)
+import GHC.TypeLits hiding (Mod)
+#else
 import GHC.TypeLits
+#endif
 import Data.Proxy(Proxy)
 import Foreign.ForeignPtr(castForeignPtr)
 import Foreign.Storable
 import Data.Ratio
 import Data.Complex
 import Control.DeepSeq ( NFData(..) )
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 
 
diff --git a/packages/base/src/Internal/Util.hs b/packages/base/src/Internal/Util.hs
index ec21fe4..8c8a31e 100644
--- a/packages/base/src/Internal/Util.hs
+++ b/packages/base/src/Internal/Util.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -80,6 +81,9 @@ import Control.Arrow((&&&),(***))
 import Data.Complex
 import Data.Function(on)
 import Internal.ST
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 type ℝ = Double
 type ℕ = Int
diff --git a/packages/base/src/Numeric/LinearAlgebra.hs b/packages/base/src/Numeric/LinearAlgebra.hs
index fd100e0..73d4a13 100644
--- a/packages/base/src/Numeric/LinearAlgebra.hs
+++ b/packages/base/src/Numeric/LinearAlgebra.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 
 -----------------------------------------------------------------------------
@@ -190,6 +191,9 @@ import Internal.Random
 import Internal.Sparse((!#>))
 import Internal.CG
 import Internal.Conversion
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 {- | dense matrix product
 
diff --git a/packages/base/src/Numeric/LinearAlgebra/HMatrix.hs b/packages/base/src/Numeric/LinearAlgebra/HMatrix.hs
index 5ce529c..3a84645 100644
--- a/packages/base/src/Numeric/LinearAlgebra/HMatrix.hs
+++ b/packages/base/src/Numeric/LinearAlgebra/HMatrix.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 --------------------------------------------------------------------------------
 {- |
 Module      :  Numeric.LinearAlgebra.HMatrix
@@ -19,6 +20,9 @@ module Numeric.LinearAlgebra.HMatrix (
 import Numeric.LinearAlgebra
 import Internal.Util
 import Internal.Algorithms(cholSH, mbCholSH, eigSH', eigenvaluesSH', geigSH')
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 infixr 8 <·>
 (<·>) :: Numeric t => Vector t -> Vector t -> t
diff --git a/packages/base/src/Numeric/LinearAlgebra/Static.hs b/packages/base/src/Numeric/LinearAlgebra/Static.hs
index 3000dcb..e328904 100644
--- a/packages/base/src/Numeric/LinearAlgebra/Static.hs
+++ b/packages/base/src/Numeric/LinearAlgebra/Static.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
@@ -80,6 +81,9 @@ import Control.Arrow((***))
 import Text.Printf
 import Data.Type.Equality ((:~:)(Refl))
 import qualified Data.Bifunctor as BF (first)
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 ud1 :: R n -> Vector ℝ
 ud1 (R (Dim v)) = v
diff --git a/packages/base/src/Numeric/Matrix.hs b/packages/base/src/Numeric/Matrix.hs
index 5400f26..06da150 100644
--- a/packages/base/src/Numeric/Matrix.hs
+++ b/packages/base/src/Numeric/Matrix.hs
@@ -32,8 +32,11 @@ import Internal.Element
 import Internal.Numeric
 import qualified Data.Monoid as M
 import Data.List(partition)
+import qualified Data.Foldable as F
+import qualified Data.Semigroup as S
 import Internal.Chain
 
+
 -------------------------------------------------------------------
 
 instance Container Matrix a => Eq (Matrix a) where
@@ -84,6 +87,11 @@ adaptScalarM f1 f2 f3 x y
     | isScalar y = f3 x (y @@>(0,0) )
     | otherwise = f2 x y
 
+instance (Container Vector t, Eq t, Num (Vector t), Product t) => S.Semigroup (Matrix t)
+  where
+    (<>) = mappend
+    sconcat = mconcat . F.toList
+
 instance (Container Vector t, Eq t, Num (Vector t), Product t) => M.Monoid (Matrix t)
   where
     mempty = 1