diff --git a/libc/include/locale.h b/libc/include/locale.h
index 2a11b04..65b5c7d 100644
--- a/libc/include/locale.h
+++ b/libc/include/locale.h
@@ -51,6 +51,10 @@
 
 extern char *setlocale(int category, const char *locale);
 
+/* Make libstdc++-v3 happy.  */
+struct lconv { };
+struct lconv *localeconv(void);
+
 __END_DECLS
 
 #endif /* _LOCALE_H_ */