mkdepgraph: 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/mkdepgraph - from package: anthy

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

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