diff --git a/AFNetworking/AFHTTPClient.h b/AFNetworking/AFHTTPClient.h
index 0e2c77a..869282e 100755
--- a/AFNetworking/AFHTTPClient.h
+++ b/AFNetworking/AFHTTPClient.h
@@ -78,6 +78,12 @@ typedef enum {
     AFNetworkReachabilityStatusReachableViaWWAN = 1,
     AFNetworkReachabilityStatusReachableViaWiFi = 2,
 } AFNetworkReachabilityStatus;
+#else
+#warning "SystemConfiguration framework not found in project, or not included in precompiled header. Network reachability functionality will not be available."
+#endif
+
+#ifndef __UTTYPE__
+#warning "CoreServices framework not found in project, or not included in precompiled header. Automatic MIME type detection when uploading files in multipart requests will not be available."
 #endif
 
 typedef enum {