drc: 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/drc - from package: drc

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

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