anchor.diff:    && git config --system credential.helper 'cache --timeout=3600' \
     && git config --system push.default simple \
     ## Set up S6 init system
  -  && wget -P /tmp/ https://github.com/just-containers/s6-overlay/releases/download/v1.21.8.0/s6-overlay-amd64.tar.gz \
  +  && wget -P /tmp/ https://github.com/just-containers/s6-overlay/releases/download/v1.22.0.0/s6-overlay-amd64.tar.gz \
     && tar xzf /tmp/s6-overlay-amd64.tar.gz -C / \
     && mkdir -p /etc/services.d/rstudio \
     && echo '#!/bin/bash ' > /etc/services.d/rstudio/run \
  
positive.code: 
  ARG RSTUDIO_VERSION
  ARG PANDOC_TEMPLATES_VERSION 
  ENV PANDOC_TEMPLATES_VERSION ${PANDOC_TEMPLATES_VERSION:-2.1.1}
  
  ## Add RStudio binaries to PATH
  ENV PATH /usr/lib/rstudio-server/bin:$PATH
  
negative.code:      
  RUN RSTUDIO_LATEST=$(wget --no-check-certificate -qO- https://s3.amazonaws.com/rstudio-server/current.ver) \
    && [ -z "$RSTUDIO_VERSION" ] && RSTUDIO_VERSION=$RSTUDIO_LATEST || true \
    #&& wget -q http://download2.rstudio.org/rstudio-server-${RSTUDIO_VERSION}-amd64.deb \
    #&& dpkg -i rstudio-server-${RSTUDIO_VERSION}-amd64.deb \
    && wget -q https://s3.amazonaws.com/rstudio-ide-build/server/trusty/amd64/rstudio-server-1.2.1293-amd64.deb \
    && dpkg -i rstudio-server-1.2.1293-amd64.deb \
    && rm rstudio-*-amd64.deb \
    ## Symlink pandoc & standard pandoc templates for use system-wide
    && ln -s /usr/lib/rstudio-server/bin/pandoc/pandoc /usr/local/bin \
  