rivet-config: 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/rivet-config - from package: librivet-dev

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

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