apt-get-build-depends: 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/apt-get-build-depends - from package: haskell-debian-utils

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

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