IPv4 and IPv6 SOCKS proxy

$ cat Makefile
XTERM=/usr/bin/xterm
SSH=/usr/bin/ssh
GEOMETRY=169x39-0-0
IPv6_LOCALHOST=::1
PROXY_PORT=1080
SSH_PORT?=22
IPv4_PROXY=127.128.129.130
IPv6_PROXY=${IPv6_LOCALHOST}
IPv4_REMOTE?=127.126.125.124
IPv6_REMOTE=${IPv6_LOCALHOST}
IPv4_BIND=127.127.127.127
IPv6_BIND=${IPv6_LOCALHOST}

proxy:
        ${XTERM} -geometry ${GEOMETRY} -iconic -T "IPv4 proxy" \
          -e ${SSH} -v -x -n -N -b $(IPv4_BIND) -p ${SSH_PORT} \
          -D ${IPv4_PROXY}:${PROXY_PORT} ${IPv4_REMOTE} &
        ${XTERM} -geometry ${GEOMETRY} -iconic -T "IPv6 proxy" \
         -e ${SSH} -v -x -n -N -b $(IPv6_BIND) -p ${SSH_PORT} \
         -D [${IPv6_PROXY}]:${PROXY_PORT} ${IPv6_REMOTE} &

$ make proxy

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