cfft: 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/cfft - from package: clipper

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

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