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-rw-r--r--src/flex.skl2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/flex.skl b/src/flex.skl
index f2da3a3..aae5560 100644
--- a/src/flex.skl
+++ b/src/flex.skl
@@ -221,7 +221,7 @@ m4_ifdef( [[M4_YY_TABLES_EXTERNAL]],
m4_ifdef( [[M4_YY_ALWAYS_INTERACTIVE]], ,
[[m4_ifdef( [[M4_YY_NEVER_INTERACTIVE]], ,
[[#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 1 /* for fileno() */
+#define _POSIX_C_SOURCE 200809 /* for fileno() */
#ifndef _POSIX_SOURCE
#define _POSIX_SOURCE 1
#endif