cinvfft: 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 CentOS possible default full paths are:

/usr/bin/cinvfft - from package: clipper

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