diff --git a/libc/include/string.h b/libc/include/string.h
index b46100a..435923b 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -82,6 +82,10 @@
 
 extern char*  strsignal(int  sig);
 
+/* Just declared to make libstdc++-v3 happy.  */
+extern int    strcoll (const char *, const char *);
+extern size_t strxfrm (char *, const char *, size_t);
+
 __END_DECLS
 
 #endif /* _STRING_H_ */