anchor.diff:  	ruby25                                                \
   	ruby26
   
  +# Install windows build tools (mingw) and libraries.
  +RUN mkdir -p /opt/wincross/archives                && \
  +    cd /opt/wincross                               && \
  +    mkdir java                                     && \
  +    wget -O archives/jdk8.zip https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u252-b09.1/OpenJDK8U-jdk_x86-32_windows_hotspot_8u252b09.zip && \
  +    unzip -d archives/java archives/jdk8.zip       && \
  +    mv archives/java/jdk*/* java                   && \
  +    mkdir lua51                                    && \
  +    wget -O archives/lua51.zip https://sourceforge.net/projects/luabinaries/files/5.1.5/Windows%20Libraries/Dynamic/lua-5.1.5_Win64_dllw6_lib.zip && \
  +    unzip -d lua51 archives/lua51.zip              && \
  +    mkdir lua52                                    && \
  +    wget -O archives/lua52.zip https://sourceforge.net/projects/luabinaries/files/5.2.4/Windows%20Libraries/Dynamic/lua-5.2.4_Win64_dllw6_lib.zip && \
  +    unzip -d lua52 archives/lua52.zip              && \
  +    mkdir lua53                                    && \
  +    wget -O archives/lua53.zip https://sourceforge.net/projects/luabinaries/files/5.3.5/Windows%20Libraries/Dynamic/lua-5.3.5_Win64_dllw6_lib.zip && \
  +    unzip -d lua53 archives/lua53.zip              && \
  +    rm -rf archives
  +
   # Run environment.
   CMD /bin/bash
  
positive.code: 
  # Install macosx build tools (osxcross) and libraries (macports).
  ENV PATH /opt/osxcross/target/bin:${PATH}
  
  RUN export SDK_VERSION=10.13 &&                               \
      export MACOSX_DEPLOYMENT_TARGET=${SDK_VERSION} &&         \
      export UNATTENDED=1 &&                                    \
  
negative.code:     wget -P tarballs https://github.com/phracker/MacOSX-SDKs/releases/download/${SDK_VERSION}/MacOSX${SDK_VERSION}.sdk.tar.xz && \
      ./build.sh &&                                             \
      osxcross-macports install                                 \
  	lua51                                                 \
  	lua52                                                 \
  	lua                                                   \
  	openjdk8                                              \
  	python27                                              \
  	python35                                              \
  