git-dpm: 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/git-dpm - from package: git-dpm

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

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