Index: benchmark/io/readv.cfa
===================================================================
--- benchmark/io/readv.cfa	(revision 038be329339961a3cec3bfe7f6650d5e05f14957)
+++ benchmark/io/readv.cfa	(revision 9987d798e132e92c92b98630dd5f1a7de52adbd4)
@@ -16,4 +16,8 @@
 #include <thread.hfa>
 #include <time.hfa>
+
+#if !defined(HAVE_LINUX_IO_URING_H)
+#warning no io uring
+#endif
 
 extern bool traceHeapOn();