I ran into something recently where the little test program that FindPCAP.cmake uses doesn't link with pthread so if someone is using PF_Ring (which requires pthread at link time) the test program will fail. I hadn't brought it up yet though because it doesn't always seem to fail and I'm not sure what the conditions for failure are yet. Maybe we should have that cmake script link the test program with pthread in case someone is using PF_Ring?
.Seth