updated for version 7.4.643
Problem:    Using the default file format for Mac files. (Issue 77)
Solution:   Reset the try_mac counter in the right place. (Oswald)
diff --git a/src/version.c b/src/version.c
index d9e9192..e74b125 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    643,
+/**/
     642,
 /**/
     641,