anchor.diff:  RUN mkdir /tmp/mpich-src
   WORKDIR /tmp/mpich-src
   RUN wget http://www.mpich.org/static/downloads/${MPICH_VERSION}/mpich-${MPICH_VERSION}.tar.gz \
  -    && tar xfz mpich-${MPICH_VERSION}.tar.gz  \
  -    && cd mpich-${MPICH_VERSION}  \
  -    && ./configure ${MPICH_CONFIGURE_OPTIONS}  \
  -    && make ${MPICH_MAKE_OPTIONS} && make install \
  -    && cd /tmp/ && rm -rf /tmp/mpich-src
  +      && tar xfz mpich-${MPICH_VERSION}.tar.gz  \
  +      && cd mpich-${MPICH_VERSION}  \
  +      && ./configure ${MPICH_CONFIGURE_OPTIONS}  \
  +      && make ${MPICH_MAKE_OPTIONS} && make install \
  +      && rm -rf /tmp/mpich-src
   
   
   #### TEST MPICH INSTALLATION ####
  
positive.code: RUN rm -rf /tmp/mpich-test
  
  
  #### FINAL CLEAN UP ####
  WORKDIR /
  RUN rm -rf /tmp/*
  
  
  #### ADD NORMAL USER ####
  ENV USERNAME user
  RUN adduser -D ${USERNAME} \
      && echo "${USERNAME}   ALL=(ALL) ALL" >> /etc/sudoers 
  USER ${USERNAME}
  
  
  WORKDIR /home/${USERNAME}
  CMD ["ash"] 
negative.code: FROM alpine:3.4
  # In case the main package repositories are down, use the alternative:
  # FROM gliderlabs/alpine:3.4
  
  MAINTAINER Nikyle Nguyen <NLKNguyen@MSN.com>
  
  RUN apk update && apk upgrade \
        && apk add --no-cache build-base
  
  
  #### INSTALL MPICH ####
  # Available at http://www.mpich.org/static/downloads/
  