diff --git a/Language/KansasLava/Fabric.hs b/Language/KansasLava/Fabric.hs
--- a/Language/KansasLava/Fabric.hs
+++ b/Language/KansasLava/Fabric.hs
@@ -34,6 +34,7 @@
 import qualified Data.Map as Map
 import Data.Map(Map)
 import Data.Ord(comparing)
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 import Language.KansasLava.Rep
 import Language.KansasLava.Signal
@@ -43,7 +44,7 @@
 -- The '_' will disappear soon from these names.
 -- | A Pad represents the type of a top-level input/output port.
 data Pad = StdLogic (Seq Bool)
-         | forall a x . (Size (W a), Show a, Rep a)
+         | forall a . (Size (W a), Show a, Rep a)
                 => StdLogicVector (Seq a)
 --         | TypedPad (...)
          | GenericPad Integer
diff --git a/Language/KansasLava/Optimization.hs b/Language/KansasLava/Optimization.hs
--- a/Language/KansasLava/Optimization.hs
+++ b/Language/KansasLava/Optimization.hs
@@ -9,7 +9,9 @@
 
 import Language.KansasLava.Types
 import Data.Reify
+import Control.Applicative
 import Control.Monad
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 import Data.List
 import Data.Default
@@ -61,6 +63,13 @@
 -- some metric based on the optimization...
 data Opt a = Opt a Int -- [String]
 
+instance Functor Opt where
+    fmap f (Opt x n) = Opt (f x) n
+
+instance Applicative Opt where
+    pure x = Opt x 0
+    (Opt f n) <*> (Opt x m) = Opt (f x) (n + m)
+
 instance Monad Opt where
     return a = Opt a 0
     (Opt a n) >>= k = case k a of
@@ -251,5 +260,3 @@
 	       , ("copy",copyElimCircuit)
 	       , ("dce",dceCircuit)
 	       ]
-
-
diff --git a/Language/KansasLava/Protocols/Patch.hs b/Language/KansasLava/Protocols/Patch.hs
--- a/Language/KansasLava/Protocols/Patch.hs
+++ b/Language/KansasLava/Protocols/Patch.hs
@@ -28,6 +28,7 @@
 import qualified Data.ByteString.Lazy as B
 import Control.Applicative
 import Control.Monad.Fix
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 ---------------------------------------------------------------------------
 -- The Patch.
diff --git a/Language/KansasLava/RTL.hs b/Language/KansasLava/RTL.hs
--- a/Language/KansasLava/RTL.hs
+++ b/Language/KansasLava/RTL.hs
@@ -25,6 +25,7 @@
 import Data.STRef
 import Data.List as L
 import Control.Monad.ST.Unsafe (unsafeInterleaveST)
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 --import Debug.Trace
 
diff --git a/Language/KansasLava/Rep.hs b/Language/KansasLava/Rep.hs
--- a/Language/KansasLava/Rep.hs
+++ b/Language/KansasLava/Rep.hs
@@ -26,6 +26,7 @@
 --import qualified Data.Maybe as Maybe
 import Data.Traversable(sequenceA)
 import qualified Data.Sized.Sampled as Sampled
+import Prelude hiding (sequenceA) -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 import Language.KansasLava.Rep.TH
 import Language.KansasLava.Rep.Class
@@ -340,4 +341,3 @@
 	toRep (XSampled (Just a))   = RepValue $ fmap Just $ M.toList $ Sampled.toMatrix a
 	fromRep r = optX (liftM (Sampled.fromMatrix . M.fromList) $ getValidRepValue r)
 	showRep = showRepDefault
-
diff --git a/Language/KansasLava/Signal.hs b/Language/KansasLava/Signal.hs
--- a/Language/KansasLava/Signal.hs
+++ b/Language/KansasLava/Signal.hs
@@ -13,6 +13,7 @@
 import Control.Monad (liftM, liftM2, liftM3)
 import Data.List as List
 import Data.Bits
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 import Data.Sized.Ix
 import Data.Sized.Matrix as M
diff --git a/Language/KansasLava/Stream.hs b/Language/KansasLava/Stream.hs
--- a/Language/KansasLava/Stream.hs
+++ b/Language/KansasLava/Stream.hs
@@ -8,8 +8,8 @@
 import qualified Data.Foldable as F
 import Control.Applicative
 import Control.Monad
-import Prelude hiding (zipWith,zipWith3, repeat)
 import Data.Monoid
+import Prelude hiding (zipWith,zipWith3, repeat)
 import qualified Data.List as List
 import Data.Dynamic
 import Debug.Trace
diff --git a/Language/KansasLava/Test.hs b/Language/KansasLava/Test.hs
--- a/Language/KansasLava/Test.hs
+++ b/Language/KansasLava/Test.hs
@@ -40,8 +40,9 @@
 import Data.Maybe as Maybe
 import Data.Default
 --import Data.Sized.Unsigned
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
-import System.Cmd
+import System.Process
 import System.Console.CmdArgs hiding (Default,def,name,summary,opt)
 import System.Directory
 import System.Environment
diff --git a/Language/KansasLava/Types.hs b/Language/KansasLava/Types.hs
--- a/Language/KansasLava/Types.hs
+++ b/Language/KansasLava/Types.hs
@@ -67,7 +67,8 @@
 import Data.Ratio
 import qualified Data.Traversable as T
 import Data.Sized.Ix
-import GHC.Exts( IsString(..) )
+import Data.String ( IsString(..) )
+import Prelude -- https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#GHCsaysTheimportof...isredundant
 
 -------------------------------------------------------------------------
 -- | Type captures HDL-representable types.
@@ -497,6 +498,7 @@
 instance (Size w) => Num (BitPat w) where
     (+) = error "(+) undefined for BitPat"
     (*) = error "(*) undefined for BitPat"
+    negate = error "negate undefined for BitPat"
     abs = error "abs undefined for BitPat"
     signum = error "signum undefined for BitPat"
     fromInteger n
diff --git a/kansas-lava.cabal b/kansas-lava.cabal
--- a/kansas-lava.cabal
+++ b/kansas-lava.cabal
@@ -1,5 +1,5 @@
 Name:               kansas-lava
-Version:            0.2.4.2
+Version:            0.2.4.3
 Synopsis:           Kansas Lava is a hardware simulator and VHDL generator.
 
 Description: 
@@ -91,7 +91,7 @@
        Paths_kansas_lava
 
 -- need a module refactor to address the orphan warnings
-  Ghc-Options: -Wall  -fno-warn-orphans
+  Ghc-Options: -Wall  -fno-warn-orphans -fno-warn-tabs
   default-language:    Haskell2010
 
 --  Ghc-Prof-options:  -auto-all
@@ -123,7 +123,7 @@
       buildable: False
     Main-Is:        Main.hs
     Hs-Source-Dirs: ., tests
-    Ghc-Options: -Wall 
+    Ghc-Options: -Wall -fno-warn-tabs
                  -fno-warn-orphans -fcontext-stack=256
                  -threaded -rtsopts
     default-language:    Haskell2010
@@ -154,7 +154,7 @@
       buildable: False
     Main-Is:        GenReport.hs
     Hs-Source-Dirs:  ., tests
-    Ghc-Options: -Wall  -fno-warn-incomplete-patterns
+    Ghc-Options: -Wall -fno-warn-tabs -fno-warn-incomplete-patterns
                  -fno-warn-orphans -fcontext-stack=256
     default-language:    Haskell2010
 
@@ -183,7 +183,7 @@
       buildable: False
     Main-Is:        TBF2VCD.hs
     Hs-Source-Dirs: ., tools
-    Ghc-Options: -Wall  -fno-warn-orphans
+    Ghc-Options: -Wall -fno-warn-tabs -fno-warn-orphans
     default-language:    Haskell2010
 
 source-repository head
@@ -194,4 +194,4 @@
   type:     git
   location: git://github.com/ku-fpg/kansas-lava.git
   branch:   kansas-lava-0.2.4
-  tag:	    0.2.4.2
+  tag:	    0.2.4.3