Index: include/utf8/wchar.h.in
--- include/utf8/wchar.h.in.orig	2000-04-22 19:47:28 +0200
+++ include/utf8/wchar.h.in	2010-01-05 16:34:56 +0100
@@ -325,6 +325,7 @@
 /* X/Open extension. */
 /* Determine number of column positions required for C. */
 #ifndef LIBUTF8_PLUG
+#undef wcwidth
 #define wcwidth utf8_wcwidth
 #endif
 #if defined(LIBUTF8_PLUG) && defined(__sun) /* Solaris 2.7 */
