dfblayer: 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/dfblayer - from package: directfb

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

On Debian possible default full paths are:

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

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

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