fixed compiler warning

diff --git a/utf8.c b/utf8.c
index 8541b4e6367a564780631ea3e8fad99c122f2393..824da092e04eb309745fac51848073cd254f92db 100644 (file)
--- a/utf8.c
+++ b/utf8.c
@@ -4,6 +4,7 @@
   @license BSD 2-clause License
 */
 #include "edit.h"
+#define __USE_XOPEN
 #include <wchar.h>
 
 const uint8_t UTF8_SeqBits[] = { 0x00u, 0x80u, 0xC0u, 0xE0u, 0xF0u, 0xF8u, 0xFCu, 0xFEu };