svn-buildpackage: 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

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/svn-buildpackage - from package: svn-buildpackage

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