xdpkg-checkbuilddeps: 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/xdpkg-checkbuilddeps - from package: debian-xcontrol

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

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