diff --git a/Assistant.hs b/Assistant.hs
index 3c79c476cc..67398f23b8 100644
--- a/Assistant.hs
+++ b/Assistant.hs
@@ -45,7 +45,6 @@ import Assistant.Threads.XMPPClient
 import Assistant.Threads.XMPPPusher
 #endif
 #else
-#warning Building without the webapp. You probably need to install Yesod..
 import Assistant.Types.UrlRenderer
 #endif
 import qualified Utility.Daemon
diff --git a/BuildFlags.hs b/BuildFlags.hs
index 1dba47eafa..e5d389d280 100644
--- a/BuildFlags.hs
+++ b/BuildFlags.hs
@@ -14,21 +14,33 @@ buildFlags = filter (not . null)
 	[ ""
 #ifdef WITH_ASSISTANT
 	, "Assistant"
+#else
+#warning Building without the assistant.
 #endif
 #ifdef WITH_WEBAPP
 	, "Webapp"
+#else
+#warning Building without the webapp. You probably need to install Yesod..
 #endif
 #ifdef WITH_PAIRING
 	, "Pairing"
+#else
+#warning Building without local pairing.
 #endif
 #ifdef WITH_TESTSUITE
 	, "Testsuite"
+#else
+#warning Building without the testsuite.
 #endif
 #ifdef WITH_S3
 	, "S3"
+#else
+#warning Building without S3.
 #endif
 #ifdef WITH_WEBDAV
 	, "WebDAV"
+#else
+#warning Building without WebDAV.
 #endif
 #ifdef WITH_INOTIFY
 	, "Inotify"
@@ -44,21 +56,29 @@ buildFlags = filter (not . null)
 #endif
 #ifdef WITH_XMPP
 	, "XMPP"
+#else
+#warning Building without XMPP.
 #endif
 #ifdef WITH_DNS
 	, "DNS"
 #endif
 #ifdef WITH_FEED
 	, "Feeds"
+#else
+#warning Building without Feeds.
 #endif
 #ifdef WITH_QUVI
 	, "Quvi"
+#else
+#warning Building without quvi.
 #endif
 #ifdef WITH_TDFA
 	, "TDFA"
 #endif
 #ifdef WITH_CRYPTOHASH
 	, "CryptoHash"
+#else
+#warning Building without CryptoHash.
 #endif
 #ifdef WITH_EKG
 	, "EKG"