[ns] crcn installation problem

Using Ubuntu 11.10 installed Ns2.35
Installing crcn:
Problem in step 6 make depend
HTML output shows atfer entering "make depend"

emulate/net-pcap.cc:64:18: fatal error: pcap.h: No such file or directory
compilation terminated.

What should I do?

Reference: http://stuweb.ee.mtu.edu/~ljialian/installation.hts
Thanks

Sincerely,Khaled Elmishad

Senior Student, Communication Engineering ASU-CHEP