ocamlrun: 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/ocamlrun - from package: ocaml-runtime

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

On Debian possible default full paths are:

/usr/bin/ocamlrun - from package: ocaml-base-nox

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

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