directfb-config: 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/directfb-config - from package: libdirectfb-dev

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

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