grcompiler: 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
/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/grcompiler - from package: grcompiler

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