From f995e843e2c5a771b1bcd8e9c68078387d7cefce Mon Sep 17 00:00:00 2001
From: Erik de Castro Lopo <erikd@mega-nerd.com>
Date: Sun, 23 Oct 2016 12:55:32 +1100
Subject: [PATCH] Fix CPP usage

The code `#if WINDOWS` works but is not really correct. GHC HEAD now
has a `-Wcpp-undef` warning that we would like to turn on and hence
need this fixed.
---
 System/Process/Internals.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/System/Process/Internals.hs b/System/Process/Internals.hs
index c4d5be3b..af420093 100644
--- a/System/Process/Internals.hs
+++ b/System/Process/Internals.hs
@@ -50,7 +50,7 @@ import System.Posix.Internals (FD)
 
 import System.Process.Common
 
-#if WINDOWS
+#ifdef WINDOWS
 import System.Process.Windows
 #else
 import System.Process.Posix