compile under c89

1 files changed, 7 insertions, 1 deletions

diff --git a/src/stdlib/wcstombs.c b/src/stdlib/wcstombs.c
index 62524aa3..76958ae9 100644
--- a/src/stdlib/wcstombs.c
+++ b/src/stdlib/wcstombs.c
@@ -1,7 +1,13 @@
 #include <stdlib.h>
-#include <wchar.h>
 #include "_stdlib.h"
 
+#ifdef __STDC_VERSION__
+#include <wchar.h>
+#else
+static size_t wcslen(const wchar_t *);
+#include "wchar/wcslen.c"
+#endif
+
 /** convert wide character string to multibyte string **/
 
 size_t wcstombs(char * restrict s, const wchar_t * restrict pwcs, size_t n)