Workaround for GHC-8.4.x

* Adds missing Semigroup instances
* Adds `semigroups` to the deps of `hmatrix`
* Hides conflicting names from import list with base >= 4.11
    * `(Prelude.<>)` and `GHC.TypeNats.Mod`

2 files changed, 8 insertions, 1 deletions

diff --git a/packages/gsl/src/Numeric/GSL/Fitting.hs b/packages/gsl/src/Numeric/GSL/Fitting.hs
index 9a2f665..8f2eae3 100644
--- a/packages/gsl/src/Numeric/GSL/Fitting.hs
+++ b/packages/gsl/src/Numeric/GSL/Fitting.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 
 {- |
@@ -58,6 +59,9 @@ import Numeric.GSL.Internal
 import Foreign.Ptr(FunPtr, freeHaskellFunPtr)
 import Foreign.C.Types
 import System.IO.Unsafe(unsafePerformIO)
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 -------------------------------------------------------------------------
 
diff --git a/packages/gsl/src/Numeric/GSL/Random.hs b/packages/gsl/src/Numeric/GSL/Random.hs
index aad9ad9..20a6c31 100644
--- a/packages/gsl/src/Numeric/GSL/Random.hs
+++ b/packages/gsl/src/Numeric/GSL/Random.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Numeric.GSL.Random
@@ -30,7 +31,9 @@ import Numeric.LinearAlgebra.HMatrix hiding (
     randn
     )
 import System.Random(randomIO)
-
+#if MIN_VERSION_base(4,11,0)
+import Prelude hiding ((<>))
+#endif
 
 type Seed = Int