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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 eb97470afa..fcd1a9502f 100644
--- a/include/features.h
+++ b/include/features.h
@@ -33,6 +33,8 @@
Extensions to ISO C11 from TS 18661-4:2015.
__STDC_WANT_IEC_60559_TYPES_EXT__
Extensions to ISO C11 from TS 18661-3:2015.
+ __STDC_WANT_IEC_60559_EXT__
+ ISO C2X interfaces defined only in Annex F.
_POSIX_SOURCE IEEE Std 1003.1.
_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;