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 (`command -v brew >/dev/null`); then # mac os x with brew
   if [ -f `brew --prefix`/etc/autojump ]; then
     . `brew --prefix`/etc/autojump
   fi

 fi