anchor.diff:      libcap \
       libevent \
       su-exec \
  -    zlib && \
  +    xz-libs \
  +    zlib \
  +    zstd && \
     apk add --virtual build \
       build-base \
       ca-certificates \
  
positive.code:   rm -rf /tmp/v${CONFD_VERSION}.tar.gz
  
  
  FROM alpine:3.6
  
  ARG TOR_VERSION=0.3.2.9
  ARG BUILD_DATE
  
negative.code: # Multi-Stage build - https://goo.gl/qejG4w
  FROM golang:1.9-alpine3.7 as confd
  
  ARG CONFD_VERSION=0.15.0
  
  WORKDIR /tmp
  RUN \
  