HELP! Problem on installation of Asterisk

Hi guys, before all i hope that my bad english isn’t a problem, so…

i have a problem on installation of asterisk, i followed this tutorial but when i write /etc/init.d/asterisk start the terminal show this message “Error /usr/sbin/asterisk not foung”

pls help me!!! and again, sorry for my bad english

It failed to get as far as make install.