makedeltaiso: 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/makedeltaiso - from package: deltaiso

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

On Debian possible default full paths are:

/usr/bin/makedeltaiso - from package: deltarpm

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

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