diff -ru openssh-5.2p1/mux.c openssh-5.2p1+iPhone/mux.c
--- openssh-5.2p1/mux.c	2008-06-13 23:01:54.000000000 +0000
+++ openssh-5.2p1+iPhone/mux.c	2011-02-14 21:58:09.000000000 +0000
@@ -85,7 +85,7 @@
 extern Options options;
 extern int stdin_null_flag;
 extern char *host;
-int subsystem_flag;
+extern int subsystem_flag;
 extern Buffer command;
 
 /* Context for session open confirmation callback */