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-rw-r--r--Source/kwsys/testProcess.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/Source/kwsys/testProcess.c b/Source/kwsys/testProcess.c
index eed770cd85..fcc31daf20 100644
--- a/Source/kwsys/testProcess.c
+++ b/Source/kwsys/testProcess.c
@@ -1,5 +1,9 @@
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing#kwsys for details. */
+#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__OpenBSD__)
+/* NOLINTNEXTLINE(bugprone-reserved-identifier) */
+# define _XOPEN_SOURCE 600
+#endif
#include "kwsysPrivate.h"
#include KWSYS_HEADER(Process.h)
#include KWSYS_HEADER(Encoding.h)