dfbinspector: 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/dfbinspector - from package: directfb

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

On Debian possible default full paths are:

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

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

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