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-rw-r--r--math/bits/mathcalls.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index 7f41ef9711..0a4f3eaab4 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -210,6 +210,9 @@ __MATHCALLX (nan,, (__const char *__tagb), (__const__));
 #endif
 
 
+/* Return nonzero if VALUE is not a number.  */
+__MATHDECLX (int,__isnan,, (_Mdouble_ __value), (__const__));
+
 #if defined __USE_MISC || defined __USE_XOPEN
 /* Return nonzero if VALUE is not a number.  */
 __MATHDECLX (int,isnan,, (_Mdouble_ __value), (__const__));