xdt-autogen: 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 CentOS possible default full paths are:

/usr/bin/xdt-autogen - from package: xfce4-dev-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/xdt-autogen - from package: xfce4-dev-tools

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

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