fusion_fork: 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/fusion_fork - from package: directfb

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

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