--- a/src/java.base/share/native/libfdlibm/fdlibm.h	Wed Aug 21 12:34:37 2019 -0700
+++ b/src/java.base/share/native/libfdlibm/fdlibm.h	Wed Aug 21 13:49:16 2019 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 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
@@ -25,7 +25,7 @@
 
 #ifdef _ALLBSD_SOURCE
 #include <machine/endian.h>
-#elif __linux__
+#elif defined(__linux__)
 #define __USE_BSD 1
 #include <endian.h>
 #endif