diff --git a/linear-programming.cabal b/linear-programming.cabal
--- a/linear-programming.cabal
+++ b/linear-programming.cabal
@@ -1,6 +1,6 @@
 Cabal-Version:    2.2
 Name:             linear-programming
-Version:          0.0
+Version:          0.0.0.1
 License:          BSD-3-Clause
 License-File:     LICENSE
 Author:           Henning Thielemann <haskell@henning-thielemann.de>
@@ -16,7 +16,7 @@
   Makefile
 
 Source-Repository this
-  Tag:         0.0
+  Tag:         0.0.0.1
   Type:        darcs
   Location:    https://hub.darcs.net/thielema/linear-programming/
 
diff --git a/src/Numeric/LinearProgramming/Monad.hs b/src/Numeric/LinearProgramming/Monad.hs
--- a/src/Numeric/LinearProgramming/Monad.hs
+++ b/src/Numeric/LinearProgramming/Monad.hs
@@ -21,6 +21,7 @@
 
 import qualified Control.Monad.Trans.RWS as MRWS
 import Control.Monad (when)
+import Control.Applicative (Applicative)
 
 
 newtype T sh a =
diff --git a/src/Numeric/LinearProgramming/Test.hs b/src/Numeric/LinearProgramming/Test.hs
--- a/src/Numeric/LinearProgramming/Test.hs
+++ b/src/Numeric/LinearProgramming/Test.hs
@@ -32,7 +32,7 @@
 import Data.Maybe (fromMaybe)
 import Data.Int (Int64)
 
-import Control.Applicative (liftA2)
+import Control.Applicative (liftA2, (<$>))
 
 import Text.Printf (PrintfArg, printf)