makeivs-ng: command not found

Have You tried accessing the binary with the full path?

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/makeivs-ng - from package: aircrack-ng

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