rebuildd-init-build-system: 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/sbin/rebuildd-init-build-system - from package: rebuildd

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

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