On hosts that have pcapnav-config installed, there is host lib leakage.
From config.log:
LNAVLIB='-L/usr/lib64 -lpcapnav -lpcap'
LNAV_CFLAGS='-I/usr/include'
Fix this by disabling pcapnav-config, which isn't available anyway.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>