message: darwin: changed boost install to version 1.67
diff: printf "\\n\\tChecking boost library installation.\\n"
  BVERSION=$( grep "#define BOOST_VERSION" "/usr/local/include/boost/version.hpp" 2>/dev/null | tail -1 | tr -s ' ' | cut -d\ -f3 )
  - if [ "${BVERSION}" != "106600" ]; then
  + if [ "${BVERSION}" != "106700" ]; then
  if [ ! -z "${BVERSION}" ]; then
  printf "\\tFound Boost Version %s.\\n" "${BVERSION}"
  printf "\\tEOS.IO requires Boost version 1.66.\\n"
  - printf "\\tWould you like to uninstall version %s and install Boost version 1.66.\\n" "${BVERSION}"
  + printf "\\tWould you like to uninstall version %s and install Boost version 1.67.\\n" "${BVERSION}"
  select yn in "Yes" "No"; do
  case $yn in
  [Yy]* )
  - if brew list | grep "boost"
  + if "${BREW}" list | grep "boost"
  then
  - printf "\\tUnlinking Boost Version %s.\\n" "${BVERSION}"
  - printf "\\tunlinking boost %s\\n" "${BVERSION}"
  - if ! "${BREW}" unlink boost
  + printf "\\tUninstalling Boost Version %s.\\n" "${BVERSION}"
  + if ! "${BREW}" uninstall --force boost
  then
  printf "\\tUnable to remove boost libraries at this time. 0\\n"
  printf "\\tExiting now.\\n\\n"
  fi
  else
  printf "\\tRemoving Boost Version %s.\\n" "${BVERSION}"
  - if ! sudo rm -rf "${BOOST_ROOT}/include/boost"
  + if ! sudo rm -rf "/usr/local/include/boost"
  then
  printf "\\tUnable to remove boost libraries at this time. 1\\n"
  printf "\\tExiting now.\\n\\n"
  exit 1;
  fi
  - if ! sudo rm -rf "${BOOST_ROOT}/lib/libboost*"
  + if ! sudo rm -rf "/usr/local/lib/libboost*"
  then
  printf "\\tUnable to remove boost libraries at this time. 2\\n"
  printf "\\tExiting now.\\n\\n"
  done
  fi
  printf "\\tInstalling boost libraries.\\n"
  - if [ ! -d "/usr/local/Cellar/boost/1.66.0" ]; then
  - if ! brew install "https://raw.githubusercontent.com/Homebrew/homebrew-core/76a83d798d76aa43459ceb145b721ba4a16a54a6/Formula/boost.rb"
  + if ! "${BREW}" install boost
  then
  - printf "\\tUnable to install boost 1.66 libraries at this time. 0\\n"
  + printf "\\tUnable to install boost 1.67 libraries at this time. 0\\n"
  printf "\\tExiting now.\\n\\n"
  exit 1;
  fi
  - printf "\\tPinning boost libraries.\\n"
  - if ! brew pin boost
  - then
  - printf "\\tUnable to pin boost libraries at this time. 2\\n"
  - printf "\\tExiting now.\\n\\n"
  - exit 1;
  - fi
  - else
  - if ! brew switch boost 1.66.0
  - then
  - printf "\\tUnable to swtich boost libraries to 1.66.0 at this time. 1\\n"
  - printf "\\tExiting now.\\n\\n"
  - exit;
  - fi
  - fi
  - printf "\\tBoost 1.66.0 successfully installed @ /usr/local.\\n"
  + printf "\\tBoost 1.67.0 successfully installed @ /usr/local.\\n"
  else
  - printf "\\tBoost 1.66.0 found at /usr/local.\\n"
  + printf "\\tBoost 1.67.0 found at /usr/local.\\n"
  fi
  printf "\\n\\tChecking MongoDB C++ driver installation.\\n"
  