anchor.diff: -FROM ubuntu:16.04
  +FROM ubuntu:20.04
   MAINTAINER Jason Rivers <jason@jasonrivers.co.uk>
   
   ENV NAGIOS_HOME            /opt/nagios
  
positive.code: ENV NG_CGI_DIR             ${NAGIOS_HOME}/sbin
  ENV NG_WWW_DIR             ${NAGIOS_HOME}/share/nagiosgraph
  ENV NG_CGI_URL             /cgi-bin
  ENV NAGIOS_BRANCH          nagios-4.4.5
  ENV NAGIOS_PLUGINS_BRANCH  release-2.2.1
  ENV NRPE_BRANCH            nrpe-3.2.1
  
  
  RUN echo postfix postfix/main_mailer_type string "'Internet Site'" | debconf-set-selections  && \
  
negative.code:         php-cli                             \
          php-gd                              \
          postfix                             \
          python3-pip                          \
          rsyslog                             \
          runit                               \
          smbclient                           \
  