vdk-config-2: 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/vdk-config-2 - from package: libvdk2-dev

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

Error in other languages:
vdk-config-2: bevel nie gevind nie
vdk-config-2: comandă negăsită
vdk-config-2: comando não encontrado
vdk-config-2: commande introuvable
vdk-config-2: command not found
vdk-config-2: käsku ei ole
vdk-config-2: không tìm thấy lệnh
vdk-config-2: komanda nerasta
vdk-config-2: Kommando nicht gefunden.
vdk-config-2: kommandot finns inte
vdk-config-2: komut yok
vdk-config-2: nie znaleziono polecenia
vdk-config-2: níor aimsíodh an t-ordú
vdk-config-2: no se encontró la orden
vdk-config-2: no s'ha trobat l'ordre
vdk-config-2: opdracht niet gevonden
vdk-config-2: parancs nem található
vdk-config-2: perintah tidak ditemukan
vdk-config-2: príkaz nenájdený
vdk-config-2: příkaz nenalezen
vdk-config-2: команда не найдена
vdk-config-2: командата не е открита
vdk-config-2: 命令找不到
vdk-config-2: コマンドが見つかりません