diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+# Version 0.4.1
+
+* Make findpar5.hs compile, and add it to the .cabal file
+
 # Version 0.4
 
 * Add `stack.yaml`, builds using LTS 4.2 (GHC 7.10.3)
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,25 @@
+This is the sample code to accompany the book *Parallel and Concurrent Programming in Haskell* (Simon Marlow, O'Reilly 2013).
+
+To build the code on your system, you need either:
+
+* [Stack](http://haskellstack.org)
+* [A Minimal GHC installation](https://www.haskell.org/downloads)
+* [The Haskell Platform](https://www.haskell.org/downloads#platform)
+
+## Building with Stack
+
+```
+stack build
+```
+
+will build all the executables and install them in a platform-specific
+subdirectory under `.stack-work/install`.
+
+## Building with Cabal
+
+```
+cabal sandox init
+cabal install --only-dependencies
+cabal configure
+cabal build
+```
diff --git a/findpar5.hs b/findpar5.hs
--- a/findpar5.hs
+++ b/findpar5.hs
@@ -1,13 +1,14 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 import System.Directory
 import Control.Concurrent
+import Control.Monad
 import System.FilePath
 import System.Environment
 import Data.List hiding (find)
 import GHC.Conc (getNumCapabilities)
 import Text.Printf
 
-import qualified Control.Monad.Par as P hiding (runParIO)
+import qualified Control.Monad.Par.Class as P hiding (runParIO)
 import Control.Monad.Par.IO
 import Control.Monad.IO.Class
 
@@ -62,6 +63,13 @@
 --
 
 newtype EParIO a = E { unE :: ParIO (Either SomeException a) }
+
+instance Functor EParIO where
+  fmap f e = e >>= return . f
+
+instance Applicative EParIO where
+  pure = return
+  (<*>) = ap
 
 instance Monad EParIO where
   return a = E (return (Right a))
diff --git a/parconc-examples.cabal b/parconc-examples.cabal
--- a/parconc-examples.cabal
+++ b/parconc-examples.cabal
@@ -1,5 +1,5 @@
 name:                parconc-examples
-version:             0.4
+version:             0.4.1
 synopsis:            Examples to accompany the book "Parallel and Concurrent Programming in Haskell"
 -- description:         
 license:             BSD3
@@ -33,6 +33,7 @@
                      tmvar.hs
                      windowman.hs
                      ChangeLog.md
+                     README.md
 
 -- -----------------------------------------------------------------------------
 -- Flags
@@ -733,6 +734,17 @@
                  , directory >= 1.1 && < 1.3
                  , async ==2.0.*
                  , stm ==2.4.*
+                 , transformers >=0.3 && <0.5
+                 , abstract-par ==0.3.*
+                 , monad-par >= 0.3.4 && < 0.4
+  default-language: Haskell2010
+
+executable findpar5
+  main-is: findpar5.hs
+  ghc-options: -threaded
+  build-depends:   base >= 4.5 && < 4.9
+                 , filepath >= 1.3 && < 1.5
+                 , directory >= 1.1 && < 1.3
                  , transformers >=0.3 && <0.5
                  , abstract-par ==0.3.*
                  , monad-par >= 0.3.4 && < 0.4