camlp5: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/camlp5 - from package: camlp5

You may install the required package with command apt-get install {package}
Error in other languages:
camlp5: bevel nie gevind nie
camlp5: comandă negăsită
camlp5: comando não encontrado
camlp5: commande introuvable
camlp5: command not found
camlp5: käsku ei ole
camlp5: không tìm thấy lệnh
camlp5: komanda nerasta
camlp5: Kommando nicht gefunden.
camlp5: kommandot finns inte
camlp5: komut yok
camlp5: nie znaleziono polecenia
camlp5: níor aimsíodh an t-ordú
camlp5: no se encontró la orden
camlp5: no s'ha trobat l'ordre
camlp5: opdracht niet gevonden
camlp5: parancs nem található
camlp5: perintah tidak ditemukan
camlp5: príkaz nenájdený
camlp5: příkaz nenalezen
camlp5: команда не найдена
camlp5: командата не е открита
camlp5: 命令找不到
camlp5: コマンドが見つかりません