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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 e064289f7a..a653e4d46b 100644
--- a/include/features.h
+++ b/include/features.h
@@ -230,6 +230,8 @@
#if (_POSIX_C_SOURCE - 0) >= 200112L
# define __USE_XOPEN2K 1
+# undef __USE_ISOC99
+# define __USE_ISOC99 1
#endif
#if (_POSIX_C_SOURCE - 0) >= 200809L