ocamloptp: 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/ocamloptp - from package: ocaml-nox

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

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