dh_ocamlclean: 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/dh_ocamlclean - from package: dh-ocaml

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

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