makedumpfile: 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/sbin/makedumpfile - from package: kexec-tools

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

On Debian possible default full paths are:

/usr/bin/makedumpfile - from package: makedumpfile

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

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