noweb: 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/noweb - from package: noweb

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

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