gpiv_t-avg-img: 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 Debian possible default full paths are:

/usr/bin/gpiv_t-avg-img - from package: gpivtools-mpi
/usr/bin/gpiv_t-avg-img - from package: gpivtools

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

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