if [ $commands[autojump] ]; then # check if autojump is installed
   if [ -f /usr/share/autojump/autojump.zsh ]; then # debian and ubuntu package
     . /usr/share/autojump/autojump.zsh
   elif [ -f /etc/profile.d/autojump.zsh ]; then # manual installation
     . /etc/profile.d/autojump.zsh
   elif [ $commands[brew] -a -f `brew --prefix`/etc/autojump ]; then # mac os x with brew

     . `brew --prefix`/etc/autojump
   fi

 fi