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-rw-r--r--libs/fst/scanner.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/fst/scanner.cc b/libs/fst/scanner.cc
index 18f4048cbb..f6478bcb5f 100644
--- a/libs/fst/scanner.cc
+++ b/libs/fst/scanner.cc
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <string.h>