diff --git a/gloss-raster.cabal b/gloss-raster.cabal
--- a/gloss-raster.cabal
+++ b/gloss-raster.cabal
@@ -1,5 +1,5 @@
 Name:                gloss-raster
-Version:             1.7.7.3
+Version:             1.7.7.201204.1
 License:             MIT
 License-file:        LICENSE
 Author:              Ben Lippmeier
@@ -11,6 +11,8 @@
 Homepage:            http://gloss.ouroborus.net
 Bug-reports:         gloss@ouroborus.net
 Description:
+        Legacy version for Haskell Platform 2012.04.
+        You will get better performance if you upgrade to the most recent version of GHC.
         Parallel rendering of raster images.
 
 Synopsis:
@@ -20,14 +22,14 @@
 
 Library
   Build-Depends: 
-        base       == 4.*,
-        ghc-prim   >= 0.2 && < 0.4,
-        containers == 0.5.*,
+        base       == 4.5.*,
+        ghc-prim   == 0.2.*,
+        containers == 0.4.*,
         repa       == 3.2.*,
         gloss      == 1.7.7.*
 
   ghc-options:
-        -Odph -fno-liberate-case -fllvm -optlo-O3
+        -Odph -fno-liberate-case
 
   Exposed-modules:
         Graphics.Gloss.Raster.Field