--- stdcxx-4.2.1/src/ctype.cpp 2011-01-01 16:58:38.016382244 -0500
+++ stdcxx-4.2.1/src/ctype.cpp 2011-01-01 17:05:16.501421314 -0500
@@ -33,6 +33,9 @@
#include <ctype.h>
#include <limits.h>
#include <locale.h>
+#if defined(__linux__)
+#include <wchar.h>
+#endif
#include <wctype.h>
#include <string.h> // for memset()