Use gcc -ansi -pedantic in 9c.  Fix many non-C89-isms.
diff --git a/src/cmd/sftpcache.c b/src/cmd/sftpcache.c
index 0579484..3f8ea16 100644
--- a/src/cmd/sftpcache.c
+++ b/src/cmd/sftpcache.c
@@ -179,9 +179,9 @@
 		if(fd < 0)
 			continue;
 		for(;;){
-		//	alarm(1000);
+		/*	alarm(1000); */
 			n = readstr(fd, cmd, sizeof cmd);
-		//	alarm(0);
+		/*	alarm(0); */
 			if(n <= 0)
 				break;
 			dprint("CMD %s\n", cmd);