diff --git a/Main.hs b/Main.hs
index a4c0d04..bcd9ee6 100644
--- a/Main.hs
+++ b/Main.hs
@@ -109,8 +109,7 @@ main = do
   inh  <- getGhcHandle rfd2
   outh <- getGhcHandle wfd1
   installSignalHandlers
-  lo_ref <- newIORef Nothing
-  let in_pipe = Pipe{pipeRead = inh, pipeWrite = outh, pipeLeftovers = lo_ref}
+  in_pipe <- mkPipeFromHandles inh outh
 
   when verbose $
     trace ("Trying to connect to " ++ host_ip ++ ":" ++ (show port))
@@ -307,5 +306,4 @@ socketToPipe sock = do
   hdl <- socketToHandle sock ReadWriteMode
   hSetBuffering hdl NoBuffering
 
-  lo_ref <- newIORef Nothing
-  pure Pipe{ pipeRead = hdl, pipeWrite = hdl, pipeLeftovers = lo_ref }
+  mkPipeFromHandles hdl hdl
diff --git a/cabal.project b/cabal.project
index e6fdbad..12c8d21 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1 +1,2 @@
 packages: .
+allow-newer: *
diff --git a/iserv-proxy.cabal b/iserv-proxy.cabal
index 39e5cc6..5aaea55 100644
--- a/iserv-proxy.cabal
+++ b/iserv-proxy.cabal
@@ -80,8 +80,7 @@ Library
                   directory  >= 1.3 && < 1.4,
                   network    >= 2.6,
                   filepath   >= 1.4 && < 1.5,
-                  ghci       == 9.3,
-                  libiserv   == 9.3
+                  ghci
 
 Executable iserv-proxy
    Default-Language: Haskell2010
@@ -92,8 +91,7 @@ Executable iserv-proxy
                   directory  >= 1.3 && < 1.4,
                   network    >= 2.6,
                   filepath   >= 1.4 && < 1.5,
-                  ghci       == 9.3,
-                  libiserv   == 9.3,
+                  ghci,
                   iserv-proxy
 
 Executable iserv-proxy-interpreter
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..3b7d9f1
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# Simple script to build and start the proxy. The printed args show how to use
+# it for testing a cross-compiler on the same machine.
+
+set -e
+
+GHC="${GHC:-ghc}"
+port=5005
+
+cabal build -w "$GHC" exe:iserv-proxy
+echo ghc-args: -fexternal-interpreter -pgmi=$(cabal list-bin -w "$GHC" exe:iserv-proxy) -opti=127.0.0.1 -opti=$port
+cabal run -w "$GHC" iserv-proxy-interpreter $port .
diff --git a/src/IServ/Remote/Interpreter.hs b/src/IServ/Remote/Interpreter.hs
index 9f8f88f..301a559 100644
--- a/src/IServ/Remote/Interpreter.hs
+++ b/src/IServ/Remote/Interpreter.hs
@@ -3,7 +3,8 @@ module IServ.Remote.Interpreter where
 
 import Network.Socket
 
-import IServ (serv)
+import GHCi.Server (serv)
+import GHCi.Message
 import IServ.Remote.Message
 
 import System.IO
@@ -153,7 +154,7 @@ socketToPipe sock = do
   hSetBuffering hdl NoBuffering
 
   lo_ref <- newIORef Nothing
-  pure Pipe{ pipeRead = hdl, pipeWrite = hdl, pipeLeftovers = lo_ref }
+  mkPipeFromHandles hdl hdl
 
 acceptSocket :: Socket -> IO Socket
 acceptSocket = fmap fst . accept