respected sir i m working on ns-2.29 on cygwin on window xp. i m trying to implement selective tcp which is the modification in existing newreno tcp version.i have changed the tcpnewreno.cc,tcp sink.cc.tcp.h, tcpsink.h. when i recompile ns by make clean ,make depend ,make commands the stcp stiil not work. make depend and make command show error like error1 and error2 in the last line when i run these command. will u please tell me the procedure how to make these changes effective. with regards sachin