speedy_backend: 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/speedy_backend - from package: perl-CGI-SpeedyCGI

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

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