mingw64-pkg-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/mingw64-pkg-config - from package: mingw64-filesystem

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

Error in other languages:
mingw64-pkg-config: bevel nie gevind nie
mingw64-pkg-config: comandă negăsită
mingw64-pkg-config: comando não encontrado
mingw64-pkg-config: commande introuvable
mingw64-pkg-config: command not found
mingw64-pkg-config: käsku ei ole
mingw64-pkg-config: không tìm thấy lệnh
mingw64-pkg-config: komanda nerasta
mingw64-pkg-config: Kommando nicht gefunden.
mingw64-pkg-config: kommandot finns inte
mingw64-pkg-config: komut yok
mingw64-pkg-config: nie znaleziono polecenia
mingw64-pkg-config: níor aimsíodh an t-ordú
mingw64-pkg-config: no se encontró la orden
mingw64-pkg-config: no s'ha trobat l'ordre
mingw64-pkg-config: opdracht niet gevonden
mingw64-pkg-config: parancs nem található
mingw64-pkg-config: perintah tidak ditemukan
mingw64-pkg-config: príkaz nenájdený
mingw64-pkg-config: příkaz nenalezen
mingw64-pkg-config: команда не найдена
mingw64-pkg-config: командата не е открита
mingw64-pkg-config: 命令找不到
mingw64-pkg-config: コマンドが見つかりません