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This is the check in FindPCAP.cmake:

    # We check whether pcap_lib_version is defined in the pcap header,
    # using it as a proxy for all the 0.8 API's.  if not, we fail.
    #
    check_symbol_exists( pcap_lib_version ${PCAP_INCLUDE_DIR}/pcap.h HAVE_PCAP_LIB_VERSION )
    if( NOT HAVE_PCAP_LIB_VERSION )
      message(FATAL_ERROR "You need libpcap 0.8 or later")
    endif( NOT HAVE_PCAP_LIB_VERSION )

Either the build can't find pcap.h or the version you have doesn't have:

PCAP_API const char *pcap_lib_version(void);

(PCAP_LIB_VERSION(3PCAP)
From pcap.h:

/*
 * Version number of the current version of the pcap file format.
 *
 * NOTE: this is *NOT* the version number of the libpcap library.
 * To fetch the version information for the version of libpcap
 * you're using, use pcap_lib_version().
 */
#define PCAP_VERSION_MAJOR 2
#define PCAP_VERSION_MINOR 4