/usr/bin/neon-config is in libneon27-gnutls-dev 0.30.2-2.
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 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | #! /bin/sh
# Originally from libxml, Copyright (C) Daniel Veillard
# Modifications for neon Copyright (C) 2000-2006 Joe Orton.
prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
usage()
{
    cat <<EOF
Usage: neon-config [OPTION]
Known values for OPTION are:
  --prefix=DIR		change neon 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
  --support FEATURE     exit with success if feature is supported
 Known features: 
    dav [yes], ssl [yes], zlib [yes], ipv6 [yes], lfs [no],
    i18n [yes], ts_ssl [yes]
EOF
    exit $1
}
support()
{
    if test "$1" = "yes"; then
	exit 0
    else
	exit 1
    fi
}
if test $# -eq 0; then
    usage 1
fi
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 $prefix
	;;
    --version)
	echo neon 0.30.2
	exit 0
	;;
    --help)
	usage 0
	;;
    --cflags)
       	echo -I${includedir}/neon 
       	;;
    --libs)
        LIBS="-lneon-gnutls "
	echo -Wl,-z,relro ${LIBS}
	;;
    --support)
	shift
	case "$1" in
	ssl|SSL) support yes ;;
	zlib|ZLIB) support yes ;;
	ipv6|IPV6) support yes ;;
	dav|DAV) support yes ;;
	lfs|LFS) support no ;;
	i18n|I18N) support yes ;;
	ts_ssl|TS_SSL) support yes ;;
	*) support no ;;
	esac
	;;
    *)
	usage 1 1>&2
	;;
    esac
    shift
done
exit 0
 |