anchor.diff:  
   # JavaScript
   # Already satisfied above
  +
  +# Julia
  +RUN apt-get -y install software-properties-common
  +RUN apt-add-repository -y ppa:staticfloat/juliareleases
  +RUN apt-get -y update
  +RUN apt-get -y install julia
   
   # Lua
   RUN apt-get -y install lua5.1 lua-rex-pcre luarocks
  
positive.code: # VB.Net
  RUN apt-get -y install mono-vbnc
  
  # TODO: move this up
  # Julia
  RUN apt-add-repository -y ppa:staticfloat/juliareleases
  RUN apt-get -y update
  RUN apt-get -y install julia
  
  # Erlang R17 (so I can use maps)
  RUN apt-get -y install build-essential libncurses5-dev libssl-dev
  ADD http://www.erlang.org/download/otp_src_17.5.tar.gz /tmp/
  RUN tar -C /tmp -zxf /tmp/otp_src_17.5.tar.gz
  RUN cd /tmp/otp_src_17.5 && ./configure && make && make install
  RUN rm -rf /tmp/otp_src_17.5
  # Rebar for building the Erlang implementation
  RUN git clone -q https://github.com/rebar/rebar.git
  RUN cd rebar && ./bootstrap && cp rebar /usr/local/bin
  RUN rm -rf rebar
  
  # MATLAB is proprietary/licensed. Maybe someday with Octave.
  # Swift is XCode/OS X only
  
negative.code: # C#
  RUN apt-get -y install mono-mcs
  
  # Erlang R17 (so I can use maps)
  RUN apt-get -y install build-essential libncurses5-dev libssl-dev
  RUN cd /tmp && wget http://www.erlang.org/download/otp_src_17.5.tar.gz \
      && tar -C /tmp -zxf /tmp/otp_src_17.5.tar.gz \
      && cd /tmp/otp_src_17.5 && ./configure && make && make install \
      && rm -rf /tmp/otp_src_17.5 /tmp/otp_src_17.5.tar.gz
  # Rebar for building the Erlang implementation
  RUN cd /tmp/ && git clone -q https://github.com/rebar/rebar.git \
      && cd /tmp/rebar && ./bootstrap && cp rebar /usr/local/bin \
      && rm -rf /tmp/rebar
  
  # Forth
  RUN apt-get -y install gforth
  
  # Go
  RUN apt-get -y install golang
  
  # Guile
  RUN apt-get -y install libunistring-dev libgc-dev autoconf libtool flex gettext texinfo libgmp-dev
  RUN git clone git://git.sv.gnu.org/guile.git /tmp/guile \
      && cd /tmp/guile && ./autogen.sh && ./configure && make && make install
  
  # Haskell
  RUN apt-get -y install ghc haskell-platform libghc-readline-dev libghc-editline-dev
  