camlmix: 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/camlmix - from package: camlmix

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

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