Problem installing snort 1.9.0

["Aaron Pedersen" <APedersen Interelate com>]

I am attempting to install Snort, Mysql, SnortCenter and Acid on Redhat 7.3.  Mysql, SnortCenter, ACID have all been successfully installed, however I am running into an error when I try to install snort.   When I attempted to run './configure --with-mysql' I was asked to install Libcap which I have done.  Now I am receiving the following error when I run 'Make'.

In file included from spo_alert_fast.c:42:
../../src/decode.h:33:18: pcap.h: No such file or directory
In file included from spo_alert_fast.c:50:
../../src/snort.h:29:18: pcap.h: No such file or directory


Any ideas?  

Thanks in advance,
Aaron