direct_stream: 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/direct_stream - from package: directfb

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

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