ocamlbuild.byte: 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/ocamlbuild.byte - from package: ocaml

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

On Debian possible default full paths are:

/usr/bin/ocamlbuild.byte - from package: ocaml-nox

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

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