xc-info: 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/xc-info - from package: libxc

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

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