opalcc: 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/opalcc - from package: libopenmpi-dev

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

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