message: Darwin: added additional error checking to homebrew update install
diff: $XCODESELECT --install 2>/dev/null;
  printf "\tUpdating Home Brew.\n"
  brew update
  + if [ $? -ne 0 ]; then
  + printf "\tUnable to update Home Brew at this time.\n"
  + printf "\tExiting now.\n\n"
  + exit;
  + fi
  printf "\tInstalling Dependencies.\n"
  brew install --force $DEP
  + if [ $? -ne 0 ]; then
  + printf "\tHomebrew exited with the above errors.\n"
  + printf "\tExiting now.\n\n"
  + exit;
  + fi
  brew unlink $DEP && brew link --force $DEP
  + if [ $? -ne 0 ]; then
  + printf "\tHomebrew exited with the above errors.\n"
  + printf "\tExiting now.\n\n"
  + exit;
  + fi
  break;;
  [Nn]* ) echo "User aborting installation of required dependencies, Exiting now."; exit;;
  * ) echo "Please type 1 for yes or 2 for no.";;
  