Rick Kelly writes:
> The two header files, pcap.h and pcap-namedb.h, get installed in 
> /usr/include by the Makefile for libcap.  The two header files are
> in /usr/src/lib/pcap.

Indeed. The original poster probably failed to do a "make build", or
the manual equivalent, which, among other things, installs the include
files *before* doing the compiles. (Indeed, it builds the libraries
first and installs them so subsequent executables are linked against
the freshest libraries.)

Perry