ocamlmklib: 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/ocamlmklib - from package: ocaml

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

On Debian possible default full paths are:

/usr/bin/ocamlmklib - from package: ocaml-nox

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

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