anchor.diff:  
  +# docker build --no-cache -t math-server:latest --build-arg http_proxy="http://proxy:8080" --build-arg https_proxy="http://proxy:8080" .
  +
  +# In case you're building the image behind a proxy, use
   # docker build --no-cache -t math-server:latest --build-arg http_proxy="http://proxy:8080" --build-arg https_proxy="http://proxy:8080" .
   
   # 8787 for RStudio
   # 8000 for Jupyter
   
  -# docker run -d -p 18787:8787 -p 18000:8000 -v /var/lib/sss/pipes:/var/lib/sss/pipes:ro -v /rhome:/rhome --name math-server-1 math-server:latest
  +# # docker run -d -p 8787:8787 -p 8000:8000 --name ms1 math-server
   
   FROM centos:7
   
  
positive.code: 	&& make prefix=/usr/local -j"$(nproc --all)" install \
  	&& cd .. && rm -f git-2.9.0.tar.gz && rm -rf git-2.9.0
  
  #Adolfo: usar https
  RUN git config --global url."https://".insteadOf git://
  
  # llvm needs CMake 2.8.12.2 or higher
  
negative.code: 	&& make -j"$(nproc --all)" install \
  	&& cd .. && rm -f v6.2.2.tar.gz && rm -rf node-6.2.2
  
  # Makes npm work behind proxy if http_proxy variable is set
  RUN npm config set proxy ${http_proxy} && npm config set https-proxy ${https_proxy} && npm config set registry http://registry.npmjs.org/ && npm set strict-ssl false
  
  # update npm
  