gfcombine: 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/gfcombine - from package: libgfshare-bin

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

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