jocamlopt.opt: 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/jocamlopt.opt - from package: jocaml

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