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-rw-r--r--BuildFlags.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/BuildFlags.hs b/BuildFlags.hs
index bfdbb00d6..dfebedb61 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"