From 1ac36f19335c630998873d815ec4e12dd4a515ce Mon Sep 17 00:00:00 2001
From: Joey Hess <joeyh@joeyh.name>
Date: Mon, 16 Nov 2015 19:10:38 -0400
Subject: [PATCH] warning when built w/o concurrent-output

---
 BuildFlags.hs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/BuildFlags.hs b/BuildFlags.hs
index bfdbb00d68..dfebedb61f 100644
--- a/BuildFlags.hs
+++ b/BuildFlags.hs
@@ -67,6 +67,8 @@ buildFlags = filter (not . null)
 #endif
 #ifdef WITH_CONCURRENTOUTPUT
 	, "ConcurrentOutput"
+#else
+#warning Building without ConcurrentOutput
 #endif
 #ifdef WITH_DNS
 	, "DNS"