dpkg-genbuilddeps: 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/dpkg-genbuilddeps - from package: devscripts

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

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