It doesn't exist before. Later I have added it and solved but now I have a new error
satellite/sat-hdlc.o

.rodata._ZTI4HDLC[_ZTI4HDLC]+0x8): undefined reference to 'typeinfo for satLL'
collect2:error: ld returned 1 exit status
Makefile:436: recipe for target 'ns' failed
make: *** [ns] Error 1
Ns make failed!