cs_static.cgi: 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

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/cs_static.cgi - from package: clearsilver

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