message: darwin: changed boost version in verification check to 1.66
diff: printf "\n\tChecking boost library installation.\n"
  BVERSION=`cat "${BOOST_ROOT}/include/boost/version.hpp" 2>/dev/null | grep BOOST_LIB_VERSION | tail -1 | tr -s ' ' | cut -d\ -f3 | sed 's/[^0-9_]//g'`
  - if [ "${BVERSION}" != "1_67" ]; then
  + if [ "${BVERSION}" != "1_66" ]; then
  if [ ! -z "${BVERSION}" ]; then
  printf "\tFound Boost Version ${BVERSION}.\n"
  printf "\tEOS.IO requires Boost version 1.66.\n"
  