osgkdtree: 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 Debian possible default full paths are:

/usr/bin/osgkdtree - from package: openscenegraph

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

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