/usr/bin/pcap-config is in libpcap0.8-dev 1.1.1-10.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #! /bin/sh
#
# Script to give the appropriate compiler flags and linker flags
# to use when building code that uses libpcap.
#
static=0
show_cflags=0
show_libs=0
while [ "$#" != 0 ]
do
	case "$1" in
	--static)
		static=1
		;;
	--cflags)
		show_cflags=1
		;;
	--libs)
		show_libs=1
		;;
	--additional-libs)
		show_additional_libs=1
		;;
	esac
	shift
done
if [ "$static" = 1 ]
then
	#
	# Include LIBS so that the flags include libraries containing
	# routines that libpcap uses.
	#
	if [ "$show_cflags" = 1 -a "$show_libs" = 1 ]
	then
		echo "-I/usr/include -L/usr/lib/x86_64-linux-gnu -lpcap "
	elif [ "$show_cflags" = 1 -a "$show_additional_libs" = 1 ]
	then
		echo "-I/usr/include -L/usr/lib/x86_64-linux-gnu "
	elif [ "$show_cflags" = 1 ]
	then
		echo "-I/usr/include"
	elif [ "$show_libs" = 1 ]
	then
		echo "-L/usr/lib/x86_64-linux-gnu -lpcap "
	elif [ "$show_additional_libs" = 1 ]
	then
		echo ""
	fi
else
	#
	# Omit LIBS - libpcap is assumed to be linked with those
	# libraries, so there's no need to do so explicitly.
	#
	if [ "$show_cflags" = 1 -a "$show_libs" = 1 ]
	then
		echo "-I/usr/include -L/usr/lib/x86_64-linux-gnu $RPATH -lpcap"
	elif [ "$show_cflags" = 1 -a "$show_additional_libs" = 1 ]
	then
		echo "-I/usr/include"
	elif [ "$show_cflags" = 1 ]
	then
		echo "-I/usr/include"
	elif [ "$show_libs" = 1 ]
	then
		echo "-L/usr/lib/x86_64-linux-gnu $RPATH -lpcap"
	fi
fi
 |