makedeltarpm: 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/makedeltarpm - from package: deltarpm

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

On Debian possible default full paths are:

/usr/bin/makedeltarpm - from package: deltarpm

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

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