cproto: 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/cproto - from package: cproto

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

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