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-rw-r--r--features.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/features.h b/features.h
index a14179b6a3..c38480e637 100644
--- a/features.h
+++ b/features.h
@@ -188,6 +188,9 @@
 #define __USE_REENTRANT	1
 #endif
 
+/* We do support the IEC 559 math functionality, real and complex.  */
+#define __STDC_IEC_559__		1
+#define __STDC_IEC_559_COMPLEX__	1
 
 /* This macro indicates that the installed library is the GNU C Library.
    For historic reasons the value now is 6 and this will stay from now