The relevant error in the log seems to be:
:info:build Undefined symbols for architecture x86_64:
:info:build "_format_number", referenced from:
:info:build _String_InPackets in nfcapd-nf_common.o
:info:build _String_OutPackets in nfcapd-nf_common.o
:info:build _String_InBytes in nfcapd-nf_common.o
:info:build _String_OutBytes in nfcapd-nf_common.o
:info:build _String_bps in nfcapd-nf_common.o
:info:build _String_pps in nfcapd-nf_common.o
It builds fine for me, but I'm on Snow Leopard, not Lion. I updated the port to 1.6.6 in r94646. Please wait 30 minutes, "sudo port selfupdate", and try again. Let us know if that helps or not; if not, attach the new main.log.