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-rw-r--r--wctype/wcfuncs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/wctype/wcfuncs.c b/wctype/wcfuncs.c
index 3b9296c9a7..ba4d88b50a 100644
--- a/wctype/wcfuncs.c
+++ b/wctype/wcfuncs.c
@@ -22,6 +22,10 @@
 
 #include "cname-lookup.h"
 
+/* If the program is compiled without optimization the following declaration
+   is not visible in the header.   */
+extern unsigned int *__ctype32_b;
+
 /* Provide real-function versions of all the wctype macros.  */
 
 #define	func(name, type) \