pocketsphinx_mdef_convert: 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/pocketsphinx_mdef_convert - from package: pocketsphinx

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

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