From c78c5b0a30d86ced11cf128bd88eac41e093e855 Mon Sep 17 00:00:00 2001
From: Joey Hess <joeyh@joeyh.name>
Date: Tue, 16 May 2017 21:06:34 -0400
Subject: avoid warning when the concurrent-output flag is disabled

---
 Messages/Concurrent.hs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Messages/Concurrent.hs b/Messages/Concurrent.hs
index 78eed3bb1..86a58f768 100644
--- a/Messages/Concurrent.hs
+++ b/Messages/Concurrent.hs
@@ -153,6 +153,8 @@ hideRegionsWhile a = bracketIO setup cleanup go
 		liftIO $ hFlush stdout
 		a
 #else
+#ifdef WITH_CONCURRENTOUTPUT
 #warning Building with concurrent-output older than 1.9.0 so expect some display glitches when password prompts occur in concurrent mode
+#endif
 hideRegionsWhile = id
 #endif
-- 
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