drawtree: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/drawtree - from package: phylip
/usr/lib/phylip/bin/drawtree - from package: phylip

You may install the required package with command apt-get install {package}

Error in other languages:
drawtree: bevel nie gevind nie
drawtree: comandă negăsită
drawtree: comando não encontrado
drawtree: commande introuvable
drawtree: command not found
drawtree: käsku ei ole
drawtree: không tìm thấy lệnh
drawtree: komanda nerasta
drawtree: Kommando nicht gefunden.
drawtree: kommandot finns inte
drawtree: komut yok
drawtree: nie znaleziono polecenia
drawtree: níor aimsíodh an t-ordú
drawtree: no se encontró la orden
drawtree: no s'ha trobat l'ordre
drawtree: opdracht niet gevonden
drawtree: parancs nem található
drawtree: perintah tidak ditemukan
drawtree: príkaz nenájdený
drawtree: příkaz nenalezen
drawtree: команда не найдена
drawtree: командата не е открита
drawtree: 命令找不到
drawtree: コマンドが見つかりません