dfbdump: 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/dfbdump - from package: directfb

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

On Debian possible default full paths are:

/usr/bin/dfbdump - from package: libdirectfb-bin

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

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