The former patch to sync.c was short-lived. Bruce pointed out that

"Now it is has 2 portability bugs, which is a lot for 5 lines of working code"

1 files changed, 3 insertions, 2 deletions

diff --git a/bin/sync/sync.c b/bin/sync/sync.c
index 23714f5..9a2747b 100644
--- a/bin/sync/sync.c
+++ b/bin/sync/sync.c
@@ -41,9 +41,10 @@ static char copyright[] =
 static char sccsid[] = "@(#)sync.c	8.1 (Berkeley) 5/31/93";
 #endif /* not lint */
 
-void sync();
+#include <unistd.h>
 
-void main()
+int
+main()
 {
 	sync();
 	exit(0);