wx-config-3.0: 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/wx-config-3.0 - from package: wxGTK3-devel

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

Error in other languages:
wx-config-3.0: bevel nie gevind nie
wx-config-3.0: comandă negăsită
wx-config-3.0: comando não encontrado
wx-config-3.0: commande introuvable
wx-config-3.0: command not found
wx-config-3.0: käsku ei ole
wx-config-3.0: không tìm thấy lệnh
wx-config-3.0: komanda nerasta
wx-config-3.0: Kommando nicht gefunden.
wx-config-3.0: kommandot finns inte
wx-config-3.0: komut yok
wx-config-3.0: nie znaleziono polecenia
wx-config-3.0: níor aimsíodh an t-ordú
wx-config-3.0: no se encontró la orden
wx-config-3.0: no s'ha trobat l'ordre
wx-config-3.0: opdracht niet gevonden
wx-config-3.0: parancs nem található
wx-config-3.0: perintah tidak ditemukan
wx-config-3.0: príkaz nenájdený
wx-config-3.0: příkaz nenalezen
wx-config-3.0: команда не найдена
wx-config-3.0: командата не е открита
wx-config-3.0: 命令找不到
wx-config-3.0: コマンドが見つかりません