grcc: 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/grcc - from package: gnuradio

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

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