xdt-csource: command not found

Have You tried accessing the binary with the full path?

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/xdt-csource - from package: xfce4-dev-tools

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