ngrep broken in -current

[walt]

libpcap apparently changed in -current in a way that breaks ngrep:

checking for pcap_restart in -lpcap... no
checking for pcap_yyrestart in -lpcap... no
checking for yyrestart in -lpcap... no
no yacc restart func found
perhaps libpcap wasn't compiled with bison/flex?
===>  Building for ngrep-1.40.1
make: cannot open Makefile.
*** Error code 2

This is from my existing ngrep:
#ngrep
/usr/libexec/ld-elf.so.1: Undefined symbol "yyin" referenced from COPY relocation in ngrep