makempx: 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/makempx - from package: texlive

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

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