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-rw-r--r--include/features.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index 173afc1..7bb27c5 100644
--- a/include/features.h
+++ b/include/features.h
@@ -194,6 +194,8 @@
/* This is to enable the ISO C11 extension. */
#if (defined _ISOC11_SOURCE \
|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
+# define __USE_ISOC11 1
+#endif
/* This is to enable the ISO C99 extension. */
#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \