derive: 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/derive - from package: haskell-derive-utils

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

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