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-rw-r--r--buildtools/libopt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/buildtools/libopt.c b/buildtools/libopt.c
index 04b8cec6..a0bf1cda 100644
--- a/buildtools/libopt.c
+++ b/buildtools/libopt.c
@@ -66,7 +66,7 @@
 
 -----------------------------------------------------------------------------*/
 #define _BSD_SOURCE 1      /* Make sure strdup() is in stdio.h */
-#define _XOPEN_SOURCE 600  /* Make sure strdup() is in string.h */
+#define _XOPEN_SOURCE 500  /* Make sure strdup() is in string.h */
 
 #define MAX_PREFIXES 10