fusion_reactor: 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_reactor - from package: directfb

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

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