OgreXMLConverter: 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/OgreXMLConverter - from package: ogre-1.8-tools
/usr/bin/OgreXMLConverter - from package: ogre-1.9-tools

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

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