diff -r 8c73d2a46ba9 -r bf4c808a4488 src/java.base/unix/native/libnio/ch/FileDispatcherImpl.c
--- a/src/java.base/unix/native/libnio/ch/FileDispatcherImpl.c	Wed Aug 21 12:34:37 2019 -0700
+++ b/src/java.base/unix/native/libnio/ch/FileDispatcherImpl.c	Wed Aug 21 13:49:16 2019 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -342,13 +342,13 @@
         JNU_ThrowIOExceptionWithLastError(env, "DirectIO setup failed");
         return result;
     }
-#elif F_NOCACHE
+#elif defined(F_NOCACHE)
     result = fcntl(fd, F_NOCACHE, 1);
     if (result == -1) {
         JNU_ThrowIOExceptionWithLastError(env, "DirectIO setup failed");
         return result;
     }
-#elif DIRECTIO_ON
+#elif defined(DIRECTIO_ON)
     result = directio(fd, DIRECTIO_ON);
     if (result == -1) {
         JNU_ThrowIOExceptionWithLastError(env, "DirectIO setup failed");