diff -Naurp a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
--- a/stdio-common/printf_fp.c	2021-02-03 16:46:26.887807279 +0000
+++ b/stdio-common/printf_fp.c	2021-02-03 16:50:16.604469900 +0000
@@ -151,6 +151,7 @@ static wchar_t *group_number (wchar_t *b
 			      wchar_t thousands_sep, int ngroups)
      internal_function;
 
+#ifndef __NO_LONG_DOUBLE_MATH
 static __always_inline int
 isnanl_or_pseudo (long double in)
 {
@@ -172,6 +173,7 @@ isnanl_or_pseudo (long double in)
   return __isnanl (in);
 #endif
 }
+#endif
 
 
 int