gsftopk: 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/gsftopk - from package: texlive-utils

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

On Debian possible default full paths are:

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

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

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