gftopk: 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 CentOS possible default full paths are:

/usr/bin/gftopk - from package: texlive

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gftopk - from package: texlive-binaries

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

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