ocamlfind: 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/ocamlfind - from package: ocaml-findlib

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

On Debian possible default full paths are:

/usr/bin/ocamlfind - from package: ocaml-findlib

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

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