https://bugs.gentoo.org/752051
--- a/src/html.c
+++ b/src/html.c
@@ -47,7 +47,7 @@ CHAR attr_name[DEF_STR_LEN], /* Attribut name of a HTML-Tag */
 /* ------------------------------------------------ */
 #if defined(MULTIBYTE) && !defined(HAVE_WCSCASECMP)
 #include <wchar.h>
-static int wcscasecmp(const wchar_t *s1, const wchar_t *s2)
+extern int wcscasecmp(const wchar_t *s1, const wchar_t *s2)
 {
 	size_t i;
 	wint_t c1, c2;