diff --git a/app/Main.hs b/app/Main.hs
index 25acb9c..8618420 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE OverloadedLabels #-}
 {-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE ViewPatterns #-}
 module Main
   (main)
   where
@@ -15,7 +16,7 @@ import Options.Applicative
 import Control.Lens
 import Data.Generics.Labels
 import System.OsPath (OsPath)
-import System.FilePath ((-<.>))
+import System.FilePath ((-<.>), dropExtension)
 import Effectful.FileSystem
 import Effectful
 import Effectful.FileSystem.IO qualified as FS
@@ -88,13 +89,29 @@ callQBE
 callQBE f = do
   let asm_file = f -<.> "s"
       qbe_file = f -<.> "ssa"
-  C.StdoutTrimmed stdout <-
+  C.StdoutUntrimmed stdout <-
     C.run $ C.cmd "qbe" & C.addArgs [qbe_file]
   FS.withFile asm_file FS.WriteMode \h -> do
     hPutStr h stdout
   hPutStrLn FS.stderr $ "wrote " <> T.pack asm_file
   pure asm_file
 
+callGCC
+  :: (GenSym :> es, FileSystem :> es, IOE :> es)
+  => FilePath -> List String -> Eff es FilePath
+callGCC f args = do
+  let asm_file = f -<.> "s"
+      exe = dropExtension f
+  C.StdoutTrimmed (T.words -> flags) <-
+    C.run $ C.cmd "pkg-config"
+          & C.addArgs @String ["--cflags", "--libs", "bdw-gc"]
+  C.run_ $ C.cmd "cc"
+         & C.addArgs flags
+         & C.addArgs ["-o", exe, asm_file]
+         & C.addArgs args
+  hPutStrLn FS.stderr $ "wrote " <> T.pack exe
+  pure exe
+
 driver
   :: (GenSym :> es, FileSystem :> es, IOE :> es)
   => Options -> Eff es ()
@@ -103,4 +120,5 @@ driver = runGenSym . traverseOf_ (#sourceFiles . folded) \f -> do
   anfs <- toANF f exps
   qbe <- toQBE f anfs
   callQBE f
+  callGCC f ["../runtime/gyehoek.c"]
   pure ()
diff --git a/play/t b/play/t
new file mode 100755
index 0000000..b1af0b5
Binary files /dev/null and b/play/t differ
diff --git a/play/t.anf b/play/t.anf
index 1026f62..831ceda 100644
--- a/play/t.anf
+++ b/play/t.anf
@@ -1,4 +1,4 @@
 ;;; -*- mode:scheme -*-
 
-(let ((x0 (prim:write 4))) x0)
+(let ((x0 (prim:+ 2 4)) (x1 (prim:write x0))) x1)
 
diff --git a/play/t.s b/play/t.s
index 83a7477..f8824c4 100644
--- a/play/t.s
+++ b/play/t.s
@@ -3,7 +3,7 @@
 main:
 	pushq %rbp
 	movq %rsp, %rbp
-	movl $18, %edi
+	movl $30, %edi
 	callq scm_write
 	leave
 	ret
@@ -11,4 +11,4 @@ main:
 .size main, .-main
 /* end function main */
 
-.section .note.GNU-stack,"",@progbits
\ No newline at end of file
+.section .note.GNU-stack,"",@progbits
diff --git a/play/t.scm b/play/t.scm
index 321e540..8895d2c 100644
--- a/play/t.scm
+++ b/play/t.scm
@@ -1 +1 @@
-(prim:write 4)
+(prim:write (prim:+ 2 4))
diff --git a/play/t.ssa b/play/t.ssa
index 8e05fd5..9b6d236 100644
--- a/play/t.ssa
+++ b/play/t.ssa
@@ -1,6 +1,9 @@
 export
 function w $main () {
 @start
-    %x0 =l call $scm_write (l 18)
-    ret %x0
+    %.2 =l add 10, 18
+    %.3 =l and %.2, 18446744073709551613
+    %x0 =l or %.3, 2
+    %x1 =l call $scm_write (l %x0)
+    ret %x1
 }
\ No newline at end of file