/usr/bin/gphoto2-port-config is in libgphoto2-2-dev 2.4.13-1ubuntu1.
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 73 | #! /bin/sh
# leave these definitions here
# they are required for correct interpolation of
# ${prefix}/lib/x86_64-linux-gnu and ${prefix}/include later on
prefix="/usr"
exec_prefix="${prefix}"
usage()
{
    cat <<EOF
Usage: gphoto2-port-config [OPTION]
Known values for OPTION are:
  --prefix=DIR		change libgphoto2-port prefix [default ${prefix}]
  --libs		print library linking information
  --cflags		print pre-processor and compiler flags
  --help		display this help and exit
  --version		output version information
EOF
    exit $1
}
if test $# -eq 0; then
    usage 1
fi
cflags=false
libs=false
while test $# -gt 0; do
    case "$1" in
    -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
    *) optarg= ;;
    esac
    case "$1" in
    --prefix=*)
	prefix="$optarg"
	;;
    --prefix)
	echo "/usr"
	;;
    --version)
	echo "libgphoto2_port" "0.8.0"
	exit 0
	;;
    --help)
	usage 0
	;;
    --cflags)
       	echo "-I${prefix}/include/gphoto2"
       	;;
    --libs)
       	echo "-L${prefix}/lib/x86_64-linux-gnu" -lgphoto2_port
       	;;
    *)
	usage
	exit 1
	;;
    esac
    shift
done
exit 0
 |