diff --git a/COPYING b/COPYING
deleted file mode 100644
--- a/COPYING
+++ /dev/null
@@ -1,340 +0,0 @@
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
-     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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-		    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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-
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-
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-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
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-
-This General Public License does not permit incorporating your program into
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diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,4 @@
+## 0.6.0.0
+
+* Re-licensed under BSD3
+* Updated to compile in GHC 7.8.3
diff --git a/Harpy.hs b/Harpy.hs
--- a/Harpy.hs
+++ b/Harpy.hs
@@ -1,10 +1,10 @@
 --------------------------------------------------------------------------
 -- |
 -- Module:      Harpy
--- Copyright:   (c) 2006-2007 Martin Grabmueller and Dirk Kleeblatt
--- License:     GPL
+-- Copyright:   (c) 2006-2015 Martin Grabmueller and Dirk Kleeblatt
+-- License:     BSD3
 -- 
--- Maintainer:  {magr,klee}@cs.tu-berlin.de
+-- Maintainer:  martin@grabmueller.de
 -- Stability:   provisional
 -- Portability: portable
 --
diff --git a/Harpy/Call.hs b/Harpy/Call.hs
--- a/Harpy/Call.hs
+++ b/Harpy/Call.hs
@@ -3,10 +3,10 @@
 --------------------------------------------------------------------------
 -- |
 -- Module      :  Harpy.Call
--- Copyright   :  (c) 2006-2007 Martin Grabmueller and Dirk Kleeblatt
--- License     :  GPL
+-- Copyright   :  (c) 2006-2015 Martin Grabmueller and Dirk Kleeblatt
+-- License     :  BSD3
 -- 
--- Maintainer  :  {magr,klee}@cs.tu-berlin.de
+-- Maintainer  :  martin@grabmueller.de
 -- Stability   :  provisional
 -- Portability :  non-portable
 --
@@ -19,16 +19,17 @@
 
 import Data.Word
 import Foreign.Ptr
+import Foreign.C
 
 #ifndef __HADDOCK__
 
-$(callDecl "callAsVoid" [t|()|])
+$(callDecl "callAsVoid" [t|Word32 -> IO ()|])
 -- $(callDecl "callAsWord32ToWord32" [t|Word32 -> Word32|])
 -- $(callDecl "callAs7PtrToVoid" [t|forall a b c d e f g . Ptr a -> Ptr b -> Ptr c -> Ptr d -> Ptr e -> Ptr f -> Ptr g -> () |])
 
 #else
 
-callAsVoid :: CodeGen e s ()
+callAsVoid :: Word32 -> CodeGen e s ()
 callAsWord32ToWord32 :: Word32 -> CodeGen e s Word32
 callAs7PtrToVoid :: forall a b c d e f g e' s'. Ptr a -> Ptr b -> Ptr c -> Ptr d -> Ptr e -> Ptr f -> Ptr g -> CodeGen e' s' ()
 
diff --git a/Harpy/CodeGenMonad.hs b/Harpy/CodeGenMonad.hs
--- a/Harpy/CodeGenMonad.hs
+++ b/Harpy/CodeGenMonad.hs
@@ -3,10 +3,10 @@
 --------------------------------------------------------------------------
 -- |
 -- Module:      Harpy.CodeGenMonad
--- Copyright:   (c) 2006-2007 Martin Grabmueller and Dirk Kleeblatt
--- License:     GPL
+-- Copyright:   (c) 2006-20015 Martin Grabmueller and Dirk Kleeblatt
+-- License:     BSD3
 -- 
--- Maintainer:  {magr,klee}@cs.tu-berlin.de
+-- Maintainer:  martin@grabmueller.de
 -- Stability:   provisional
 -- Portability: portable (but generated code non-portable)
 --
@@ -77,6 +77,7 @@
 
 import qualified Harpy.X86Disassembler as Dis
 
+import Control.Applicative
 import Control.Monad
 
 import Text.PrettyPrint.HughesPJ
@@ -168,6 +169,20 @@
 unCg :: CodeGen e s a -> ((e, CodeGenEnv) -> (s, CodeGenState) -> IO ((s, CodeGenState), Either ErrMsg a))
 unCg (CodeGen a) = a
 
+instance Functor (CodeGen e s) where
+  fmap f m = CodeGen (\ env state -> do
+                         r <- unCg m env state
+                         case r of
+                           (state', Left err) -> return (state', Left err)
+                           (state', Right v) -> return (state', Right $ f v))
+  
+instance Applicative (CodeGen e s) where
+  pure x = cgReturn x
+  f <*> x = do
+    f' <- f
+    x' <- x
+    return $ f' x'
+  
 instance Monad (CodeGen e s) where
     return x = cgReturn x
     fail err = cgFail err
@@ -559,7 +574,7 @@
                          _ -> ([], [], t0)
     let name = mkName ns
     let funptr = AppT (ConT $ mkName "FunPtr") t
-    let ioresult = addIO t
+    let ioresult = t -- addIO t
     let ty = AppT (AppT ArrowT funptr) ioresult
     dynName <- newName "conv"
     let dyn = ForeignD $ ImportF CCall Safe "dynamic" dynName $ ForallT tvars cxt ty
diff --git a/Harpy/X86Assembler.hs b/Harpy/X86Assembler.hs
--- a/Harpy/X86Assembler.hs
+++ b/Harpy/X86Assembler.hs
@@ -2,10 +2,10 @@
 --------------------------------------------------------------------------
 -- |
 -- Module      :  Harpy.X86Assembler
--- Copyright   :  (c) 2006-2007 Martin Grabmueller and Dirk Kleeblatt
--- License     :  GPL
+-- Copyright   :  (c) 2006-2015 Martin Grabmueller and Dirk Kleeblatt
+-- License     :  BSD3
 -- 
--- Maintainer  :  {magr,klee}@cs.tu-berlin.de
+-- Maintainer  :  martin@grabmueller.de
 -- Stability   :  provisional
 -- Portability :  non-portable
 --
diff --git a/Harpy/X86CGCombinators.hs b/Harpy/X86CGCombinators.hs
--- a/Harpy/X86CGCombinators.hs
+++ b/Harpy/X86CGCombinators.hs
@@ -1,10 +1,10 @@
 --------------------------------------------------------------------------
 -- |
 -- Module      :  X86CodeGen
--- Copyright   :  (c) 2006 Martin Grabmueller and Dirk Kleeblatt
--- License     :  GPL
+-- Copyright   :  (c) 2006-2015 Martin Grabmueller and Dirk Kleeblatt
+-- License     :  BSD3
 -- 
--- Maintainer  :  {magr,klee}@cs.tu-berlin.de
+-- Maintainer  :  martin@grabmueller.de
 -- Stability   :  quite experimental
 -- Portability :  portable (but generated code non-portable)
 --
diff --git a/Harpy/X86CodeGen.hs b/Harpy/X86CodeGen.hs
--- a/Harpy/X86CodeGen.hs
+++ b/Harpy/X86CodeGen.hs
@@ -1,10 +1,10 @@
 --------------------------------------------------------------------------
 -- |
 -- Module      :  X86CodeGen
--- Copyright   :  (c) 2006 Martin Grabmueller and Dirk Kleeblatt
--- License     :  GPL
+-- Copyright   :  (c) 2006-2015 Martin Grabmueller and Dirk Kleeblatt
+-- License     :  BSD3
 -- 
--- Maintainer  :  {magr,klee}@cs.tu-berlin.de
+-- Maintainer  :  martin@grabmueller.de
 -- Stability   :  provisional
 -- Portability :  portable (but generated code non-portable)
 --
diff --git a/Harpy/X86Disassembler.hs b/Harpy/X86Disassembler.hs
--- a/Harpy/X86Disassembler.hs
+++ b/Harpy/X86Disassembler.hs
@@ -2,9 +2,9 @@
 -- |
 -- Module      :  Harpy.X86Disassembler
 -- Copyright   :  (c) Martin Grabmueller and Dirk Kleeblatt
--- License     :  GPL
+-- License     :  BSD3
 -- 
--- Maintainer  :  {magr,klee}@cs.tu-berlin.de
+-- Maintainer  :  martin@grabmueller.de
 -- Stability   :  provisional
 -- Portability :  portable
 --
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright (c) Dirk Kleeblatt and Martin Grabmueller
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the author nor the names of his contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
diff --git a/NEWS b/NEWS
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,12 @@
 							-*-outline-*-
 * Harpy NEWS
 
+** New in version 0.6.0.0
+
+*** Re-licensed under BSD3
+
+*** Updated to work with GHC 7.8.3
+
 ** New in version 0.4.2
 
 *** package structure
diff --git a/examples/evaluator/Evaluator.hs b/examples/evaluator/Evaluator.hs
--- a/examples/evaluator/Evaluator.hs
+++ b/examples/evaluator/Evaluator.hs
@@ -14,7 +14,7 @@
 
 import Text.ParserCombinators.Parsec
 
-$(callDecl "callAsWord32" [t|Word32|])
+$(callDecl "callAsWord32" [t|Word32 -> IO Word32|])
 
 main :: IO ()
 main = do putStrLn "\n\n\n\nHarpy Interpreter"
@@ -76,14 +76,14 @@
        mov (variableAddress env c) eax
        exitCode
        d <- disassemble
-       callAsVoid
+       callAsVoid 0
        return (0, d)
 compileAndRun (Print exp) =
     do entryCode
        compileExp exp
        exitCode
        d <- disassemble
-       r <- callAsWord32
+       r <- callAsWord32 0
        return (fromIntegral r, d)
 
 compileExp :: Exp -> CodeGen (Ptr Int32) s ()
diff --git a/harpy.cabal b/harpy.cabal
--- a/harpy.cabal
+++ b/harpy.cabal
@@ -1,13 +1,12 @@
 Cabal-version:  >=1.2
 Build-type: Simple
 Name:           harpy
-Version:        0.5.0.0
-License:        GPL
-License-file:   COPYING
-Author:         Dirk Kleeblatt <klee@cs.tu-berlin.de>
+Version:        0.6.0.0
+License:        BSD3
+License-file:   LICENSE
+Author:         Dirk Kleeblatt <dirk.kleeblatt@gmx.de>
                 Martin Grabmueller <martin@grabmueller.de>
-Maintainer:     klee@cs.tu-berlin.de, martin@grabmueller.de
-Homepage:       http://code.haskell.org/harpy/
+Maintainer:     martin@grabmueller.de
 Category:       Code Generation
 Synopsis:       Runtime code generation for x86 machine code
 Description:	The package contains the following components:
@@ -31,13 +30,10 @@
 	.
 	* All the above modules use the code generation monad defined in module
 	  "Harpy.CodeGenMonad".
-        .
-        * The Darcs repo and two tutorials on using Harpy can be found at
-          Harpy's homepage: <http://uebb.cs.tu-berlin.de/harpy/>
 Stability:      Experimental
 
 Extra-source-files:
-    NEWS README Makefile
+    NEWS README Makefile ChangeLog.md
     doc/Makefile doc/tutorial.lhs doc/larger-tutorial.lhs
     examples/evaluator/ArithTypes.hs examples/evaluator/ArithParser.hs
     examples/evaluator/Evaluator.hs
