diff --git a/repa-v4l2.cabal b/repa-v4l2.cabal
--- a/repa-v4l2.cabal
+++ b/repa-v4l2.cabal
@@ -7,7 +7,7 @@
 -- The package version. See the Haskell package versioning policy
 -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
 -- standards guiding when and how versions should be incremented.
-Version:             0.1.0.0
+Version:             0.2.0.0
 
 -- A short (one-line) description of the package.
 Synopsis:            Provides high-level access to webcams.
@@ -18,9 +18,6 @@
    image processing functions and other input devices may be added.
    If anyone wants to help, please contact me!
 
-   It has been pointed out on haskell-cafe that the v4l2 package that
-   is needed by this package is not (yet?) on hackage. Therefore
-   this library is not building on hackage.   
 
 -- The license under which the package is released.
 License:             LGPL
@@ -66,11 +63,11 @@
   -- Modules exported by the library.
   Exposed-modules: Graphics.Webcam.Linux
   Other-modules: Graphics.Webcam.Linux.Internal
-  ghc-options: -fllvm  
+  ghc-options: -Odph -fno-liberate-case -funfolding-use-threshold1000 -funfolding-keeness-factor1000 -fllvm -optlo-O3
   
   -- Packages needed in order to build this package.
   Build-depends: base == 4.*,
-                 repa >= 3.0,
+                 repa >= 3.2.1.1,
                  --repa-devil >= 0.1.2,
                  transformers >= 0.2.2,
                  containers >= 0.2,
@@ -87,7 +84,7 @@
   
 Executable example
         main-is: example.hs
-        ghc-options: -fllvm -threaded
+        ghc-options: -threaded -rtsopts -Odph -fno-liberate-case -funfolding-use-threshold1000 -funfolding-keeness-factor1000 -fllvm -optlo-O3
         build-depends: gloss >= 1.7.2.1,
                        repa-v4l2 >= 0.1,
                        base == 4.*,
diff --git a/src/Graphics/Webcam/Linux/Internal.hs b/src/Graphics/Webcam/Linux/Internal.hs
--- a/src/Graphics/Webcam/Linux/Internal.hs
+++ b/src/Graphics/Webcam/Linux/Internal.hs
@@ -134,7 +134,7 @@
 {-| Save the given 'Image' as BMP in the file with the given name.
 This function currently takes a detour via lists when converting the image to a 'ByteString',
 and is therefore probably slower than necessary (FIXME). -}
-saveBmp :: (MonadIO m, Repr r Word8) => FilePath -> Image r Word8 -> V4lCamT m ()
+saveBmp :: (MonadIO m, Source r Word8) => FilePath -> Image r Word8 -> V4lCamT m ()
 saveBmp name i = do
   -- This does not compile; why not? Fill instances missing in Repa?
   -- a <- liftIO $ ((copyP i :: IO (Image B Word8)) >>=
@@ -326,12 +326,12 @@
 
 
 {-| Flips the Y axis of a given image. -}
-flipY :: Repr r a => Image r a -> Image D a
+flipY :: Source r a => Image r a -> Image D a
 flipY i = backpermute sh (\(Z :. y :. x :. j) -> Z :. h - 1 - y :. x :. j) i
   where sh@(Z :. h :. w :. k) = extent i
 
 
-rgbaToAbgr :: Repr r a => Image r a -> Image D a
+rgbaToAbgr :: Source r a => Image r a -> Image D a
 rgbaToAbgr i = backpermute sh (\(Z :. y :. x :. j) -> Z :. y :. x :. (k - 1 - j)) i
   where sh@(Z :. h :. w :. k) = extent i
 {-# INLINE rgbaToAbgr #-}
@@ -339,7 +339,7 @@
 {- FIXME: To make things faster, put swapping RGBA directly in here. -}
 {-| Converts a RGB image from the camera to an RGBA image that can e.g. be
 stored as BMP with 'saveBMP'. -}
-rgbToRgba :: Num a => Repr r a => Image r a -> Image D a
+rgbToRgba :: Num a => Source r a => Image r a -> Image D a
 rgbToRgba src | k == 3 = flipY $ traverse src shf f
               | k == 4 = delay src
               | otherwise = error "Could not convert image to rgba"