gpiv_rot90: 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_rot90 - from package: gpivtools-mpi
/usr/bin/gpiv_rot90 - from package: gpivtools

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

Error in other languages:
gpiv_rot90: bevel nie gevind nie
gpiv_rot90: comandă negăsită
gpiv_rot90: comando não encontrado
gpiv_rot90: commande introuvable
gpiv_rot90: command not found
gpiv_rot90: käsku ei ole
gpiv_rot90: không tìm thấy lệnh
gpiv_rot90: komanda nerasta
gpiv_rot90: Kommando nicht gefunden.
gpiv_rot90: kommandot finns inte
gpiv_rot90: komut yok
gpiv_rot90: nie znaleziono polecenia
gpiv_rot90: níor aimsíodh an t-ordú
gpiv_rot90: no se encontró la orden
gpiv_rot90: no s'ha trobat l'ordre
gpiv_rot90: opdracht niet gevonden
gpiv_rot90: parancs nem található
gpiv_rot90: perintah tidak ditemukan
gpiv_rot90: príkaz nenájdený
gpiv_rot90: příkaz nenalezen
gpiv_rot90: команда не найдена
gpiv_rot90: командата не е открита
gpiv_rot90: 命令找不到
gpiv_rot90: コマンドが見つかりません