dfbmaster: 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/dfbmaster - from package: directfb

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

On Debian possible default full paths are:

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

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

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