camlp5o: 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/camlp5o - from package: camlp5

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

Error in other languages:
camlp5o: bevel nie gevind nie
camlp5o: comandă negăsită
camlp5o: comando não encontrado
camlp5o: commande introuvable
camlp5o: command not found
camlp5o: käsku ei ole
camlp5o: không tìm thấy lệnh
camlp5o: komanda nerasta
camlp5o: Kommando nicht gefunden.
camlp5o: kommandot finns inte
camlp5o: komut yok
camlp5o: nie znaleziono polecenia
camlp5o: níor aimsíodh an t-ordú
camlp5o: no se encontró la orden
camlp5o: no s'ha trobat l'ordre
camlp5o: opdracht niet gevonden
camlp5o: parancs nem található
camlp5o: perintah tidak ditemukan
camlp5o: príkaz nenájdený
camlp5o: příkaz nenalezen
camlp5o: команда не найдена
camlp5o: командата не е открита
camlp5o: 命令找不到
camlp5o: コマンドが見つかりません