diff --git a/app/Gyehoek/Options.hs b/app/Gyehoek/Options.hs
new file mode 100644
index 0000000..d1e0c3e
--- /dev/null
+++ b/app/Gyehoek/Options.hs
@@ -0,0 +1,44 @@
+{-# LANGUAGE NoFieldSelectors #-}
+module Gyehoek.Options
+  ( Options(..)
+  , parser
+  )
+  where
+
+import System.IO (Handle)
+import Data.HashSet (HashSet)
+import Options.Applicative
+import qualified Data.HashSet as HS
+
+
+data Options = MkOptions
+  { -- dumpANF :: Maybe FilePath
+  -- , dumpQBE :: Maybe FilePath
+  output :: Maybe FilePath
+  , sourceFiles :: HashSet FilePath
+  }
+  deriving (Show)
+
+-- parseDumpQBE =
+--   optional $ strOption
+--     ( long "dump-qbe"
+--     <> metavar "FILE"
+--     )
+
+-- parseDumpANF =
+--   optional $ strOption
+--     ( long "dump-anf"
+--     <> metavar "FILE"
+--     )
+
+parseOutput =
+  optional $ strOption
+    ( long "output"
+    <> short 'o'
+    <> metavar "FILE"
+    )
+
+parser :: Parser Options
+parser = MkOptions
+  <$> parseOutput
+  <*> (HS.fromList <$> some (argument str (metavar "FILES")))
diff --git a/app/Main.hs b/app/Main.hs
index 590b6c1..4042ea0 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,17 +1,25 @@
-{-# LANGUAGE PatternSynonyms #-}
-{-# LANGUAGE ViewPatterns #-}
-{-# LANGUAGE BlockArguments #-}
-{-# LANGUAGE OverloadedLists #-}
 module Main
   (main)
   where
 
 import qualified Gyehoek.ANF.Syntax as ANF
 import Gyehoek.QBE (render)
+import Gyehoek.Options
 import qualified Data.Text.IO as TIO
 import Prelude hiding ((.),id)
 import Control.Category
+import Options.Applicative
 
 
 main :: IO ()
-main = TIO.putStrLn . render $ ANF.expr
+main = driver =<< execParser opts
+  where
+    opts = info (helper <*> parser)
+      ( fullDesc
+      )
+
+
+
+driver :: Options -> IO ()
+driver opts = do
+  print opts
diff --git a/gyehoek.cabal b/gyehoek.cabal
index 0393842..2939555 100644
--- a/gyehoek.cabal
+++ b/gyehoek.cabal
@@ -22,7 +22,7 @@ common ghcstuffs
     -Wall -fdefer-type-errors -fno-show-valid-hole-fits
     -fdefer-out-of-scope-variables -fplugin=Effectful.Plugin
 
-  other-extensions:
+  default-extensions:
     BlockArguments
     DeriveGeneric
     OverloadedStrings
@@ -37,14 +37,15 @@ executable gyehoek
   other-modules:
     Gyehoek.ANF.Syntax
     Gyehoek.GenSym
+    Gyehoek.Options
     Gyehoek.QBE
     Gyehoek.QBE.Parse
     Gyehoek.Scheme.Syntax
     Gyehoek.Sexp
 
-  -- other-extensions:
   build-depends:
     , base                  ^>=4.21.2.0
+    , containers
     , effectful
     , effectful-core
     , effectful-plugin
@@ -60,6 +61,7 @@ executable gyehoek
     , sexp-grammar
     , template-haskell
     , text
+    , unordered-containers
     , vector
 
   hs-source-dirs:   app
diff --git a/play/a.out b/play/a.out
deleted file mode 100755
index e0e7218..0000000
Binary files a/play/a.out and /dev/null differ
diff --git a/play/t.ssa b/play/t.ssa
deleted file mode 100644
index cd2e7f5..0000000
--- a/play/t.ssa
+++ /dev/null
@@ -1,15 +0,0 @@
-type :scm = {l 2}
-export
-function w $main () {
-@start
-    %x0 =l call $GC_malloc (l 16)
-    %.4 =l add %x0, 8
-    storel 10, %x0
-    storel 14, %.4
-    %x1 =l call $scm_write (l %x0)
-    %.5 =l mul 22, 18
-    %.6 =l and %.5, 18446744073709551613
-    %x2 =l or %.6, 2
-    %x3 =l call $scm_write (l %x2)
-    ret %x3
-}
\ No newline at end of file
diff --git a/runtime/gyehoek.c b/runtime/gyehoek.c
index 3c3e48c..6643a11 100644
--- a/runtime/gyehoek.c
+++ b/runtime/gyehoek.c
@@ -5,7 +5,7 @@ SCM scm_write (SCM x) {
   if (SCM_IMP (x)) {
     printf ("#<immediate %ld>\n", SCM_UNPACK (x) >> 2);
   } else {
-    printf ("#<heap object %ld>\n", SCM_UNPACK(x));
+    printf ("#<heap object %lx>\n", SCM_UNPACK(x));
   }
   return SCM_PACK(NULL);
 }