gquilt: 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/gquilt - from package: gquilt

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