--- vile-9.5/ucrypt.c.64bit-fixes	2001-02-13 20:39:50.000000000 -0500
+++ vile-9.5/ucrypt.c	2005-08-23 11:44:24.000000000 -0400
@@ -6,6 +6,9 @@
  *
  */
 
+#define _XOPEN_SOURCE
+#include <unistd.h>
+
 # include	"estruct.h"
 # include	"edef.h"