updated for version 7.4.644

Problem:    Stratus VOS doesn't have sync().
Solution:   Use fflush(). (Karli Aurelia)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    644,
 /**/
     643,
 /**/