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-rw-r--r--extension/inplace.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/extension/inplace.c b/extension/inplace.c
index 133b40f0..91b1a229 100644
--- a/extension/inplace.c
+++ b/extension/inplace.c
@@ -27,8 +27,12 @@
#include <config.h>
#endif
-#define _XOPEN_SOURCE
-#define _XOPEN_SOURCE_EXTENDED
+#ifndef _XOPEN_SOURCE
+# define _XOPEN_SOURCE
+#endif
+#ifndef _XOPEN_SOURCE_EXTENDED
+# define _XOPEN_SOURCE_EXTENDED 1
+#endif
#include <stdio.h>
#include <assert.h>