iperender: 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/iperender - from package: ipe

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

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