Index: libcfa/prelude/defines.hfa.in
===================================================================
--- libcfa/prelude/defines.hfa.in	(revision 4069faade93e68df42b8c7af24253b6a041b469b)
+++ libcfa/prelude/defines.hfa.in	(revision c66f6cb71ed15bdf7843d630c7719f87d009b25d)
@@ -16,4 +16,7 @@
 #undef HAVE_LINUX_IO_URING_H
 
+#undef HAVE_PREADV2
+#undef HAVE_PWRITEV2
+
 // #define __CFA_IO_POLLING_USER__
 // #define __CFA_IO_POLLING_KERNEL__