anchor.diff:  ENV BASH_ENV /etc/rubybashrc
   
   # install rubies and fix permissions on
  +ENV RVM_RUBIES 2.5.7 2.7.0
   RUN bash -c " \
       export CFLAGS='-s -O3 -fno-fast-math -fPIC' && \
  -    for v in 2.5.7 ; do \
  +    for v in ${RVM_RUBIES} ; do \
           rvm install \$v --patch \$(echo ~/patches/ruby-\$v/* | tr ' ' ','); \
       done && \
       rvm cleanup all && \
  
positive.code:     export CFLAGS='-s -O1 -fno-omit-frame-pointer -fno-fast-math' && \
      export MAKE='make V=0' && \
      rake-compiler cross-ruby VERSION=$XRUBIES HOST=<%= target %> && \
      rm -rf ~/.rake-compiler/builds ~/.rake-compiler/sources && \
      find /usr/local/rvm -type d -print0 | sudo xargs -0 chmod g+sw "
  
  
negative.code: # Install sudoers configuration
  COPY build/sudoers /etc/sudoers.d/rake-compiler-dock
  
  ENV RUBY_CC_VERSION 3.0.0:2.7.0:2.6.0:2.5.0:2.4.0:2.3.0:2.2.2
  
  CMD bash
  