anchor.diff:    libxslt-devel \
     libyaml-devel \
     make \
  +  mysql-devel \
     openssh \
     openssh-clients \
     openssh-server \
  
positive.code:   tar \
    tree \
    which \
    zlib-devel 
    
  
  ## add rbenv group
  RUN groupadd rbenv
  
negative.code: FROM centos:centos6
  MAINTAINER pepechoko
  
  RUN 
    yum update -y && \
    apt-get clean && \
    rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/* 
  
  RUN \
    rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
  
  RUN yum install -y --no-install-recommends \
    autoconf \
    automake \
    curl-devel \
  