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vty: guard definition of _XOPEN_SOURCE

Define _XOPEN_SOURCE only if it is not already provided by the build
environment.

This avoids redefinition warnings/errors while ensuring required POSIX
interfaces are available.

Change-Id: I4f53aff1afef02abce7cb70d1b29080ba900ff41
---
M src/vty/command.c
1 file changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/vty/command.c b/src/vty/command.c
index c1bda8a..38c6648 100644
--- a/src/vty/command.c
+++ b/src/vty/command.c
@@ -33,7 +33,9 @@
 #include <stdbool.h>
 #include <syslog.h>
 #include <errno.h>
+#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE
+#endif
 #include <unistd.h>
 #include <ctype.h>
 #include <time.h>

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