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-rw-r--r--wctype/wcextra.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/wctype/wcextra.c b/wctype/wcextra.c
index 7f63e7efeb..44b72c8833 100644
--- a/wctype/wcextra.c
+++ b/wctype/wcextra.c
@@ -24,6 +24,10 @@
#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;
+
int
(iswblank) (wint_t wc)
{