anchor.diff:              LDFLAGS=-Wl,-rpath=/opt/linux/ruby27/lib && \
           make && \
           make install && \
  +    wget -P /usr/local/src/lua54 \
  +        https://sourceforge.net/projects/luabinaries/files/5.4.2/Linux%20Libraries/lua-5.4.2_Linux54_64_lib.tar.gz && \
  +    mkdir -p /opt/linux/lua54 && \
  +    tar -xf /usr/local/src/lua54/lua-5.4.2_Linux54_64_lib.tar.gz \
  +        -C /opt/linux/lua54 && \
       cd /usr/local/src && rm -rf ..?* .[!.]* *
   
   # Install macosx build tools (osxcross) and libraries (macports).
  
positive.code:         ./configure && \
          make && \
          make install && \
      wget -P /usr/local/src/python36 \
          https://www.python.org/ftp/python/3.6.12/Python-3.6.12.tar.xz && \
      tar -xf /usr/local/src/python36/Python-3.6.12.tar.xz \
  
negative.code:     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/5.3.6/Windows%20Libraries/Dynamic/lua-5.3.6_Win64_dllw6_lib.zip && \
      unzip -d lua53 archives/lua53.zip              && \
      mkdir lua54                                    && \
      wget -O archives/lua54.zip https://sourceforge.net/projects/luabinaries/files/5.4.2/Windows%20Libraries/Dynamic/lua-5.4.2_Win64_dllw6_lib.zip && \
      unzip -d lua54 archives/lua54.zip              && \
      rm -rf archives
  
  # Run environment.
  