opl2ofm: 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 CentOS possible default full paths are:

/usr/bin/opl2ofm - from package: texlive

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/opl2ofm - from package: texlive-binaries

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

Error in other languages:
opl2ofm: bevel nie gevind nie
opl2ofm: comandă negăsită
opl2ofm: comando não encontrado
opl2ofm: commande introuvable
opl2ofm: command not found
opl2ofm: käsku ei ole
opl2ofm: không tìm thấy lệnh
opl2ofm: komanda nerasta
opl2ofm: Kommando nicht gefunden.
opl2ofm: kommandot finns inte
opl2ofm: komut yok
opl2ofm: nie znaleziono polecenia
opl2ofm: níor aimsíodh an t-ordú
opl2ofm: no se encontró la orden
opl2ofm: no s'ha trobat l'ordre
opl2ofm: opdracht niet gevonden
opl2ofm: parancs nem található
opl2ofm: perintah tidak ditemukan
opl2ofm: príkaz nenájdený
opl2ofm: příkaz nenalezen
opl2ofm: команда не найдена
opl2ofm: командата не е открита
opl2ofm: 命令找不到
opl2ofm: コマンドが見つかりません