libart-config: 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/libart-config - from package: gnome-libs-devel

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

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