build-rdeps: 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/build-rdeps - from package: devscripts

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

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