djvumake: 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/djvumake - from package: djvulibre

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

On Debian possible default full paths are:

/usr/bin/djvumake - from package: djvulibre-bin

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

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