anchor.diff:  # install commands
   # airstack core utilities
   ADD core /package/airstack/core
  -RUN set -e; mkdir -v /command; ln -sv /package/airstack/core/command/* /command/
  +RUN mkdir -v /command; ln -sv /package/airstack/core/command/* /command/
   
   # To minimize rebuilds, binaries that are modified less often should be in earlier RUN commands.
   
  
positive.code:   mv -f /usr/local/bin/$i'{new}' /usr/local/bin/$i
  
  # Packages::Lua
  RUN \
    set -e; /command/core-package-install libssl-dev luajit luarocks; \
    luarocks install --server=http://rocks.moonscript.org luasec OPENSSL_LIBDIR=/usr/lib/x86_64-linux-gnu/; \
    luarocks install --server=https://rocks.moonscript.org moonrocks
  
  
negative.code: 
  ################################################################################
  # DEBUG
  ################################################################################
  
  # TODO: remove this later. /command symlinks should be setup by each command.
  RUN ln -vs /command/core-* /usr/local/bin/
  
  
  ################################################################################
  