[ns] about olsr protocol

[vaishali mandhare]

 I want to add OLSR protocol in ns2 by doing necessary changes, when do 'make' 
following error is encounter what should I do. 
trace/cmu-trace.o: In function `CMUTrace::format_olsr(Packet*, int)':
cmu-trace.cc:(.text+0x2ef8): undefined reference to `OLSR_pkt::offset_'
collect2: error: ld returned 1 exit status
make: *** [ns] Error 1