libquadmath-0.dll: 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/i686-w64-mingw32/sys-root/mingw/bin/libquadmath-0.dll - from package: mingw32-gcc-gfortran
/usr/x86_64-w64-mingw32/sys-root/mingw/bin/libquadmath-0.dll - from package: mingw64-gcc-gfortran

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

Error in other languages:
libquadmath-0.dll: bevel nie gevind nie
libquadmath-0.dll: comandă negăsită
libquadmath-0.dll: comando não encontrado
libquadmath-0.dll: commande introuvable
libquadmath-0.dll: command not found
libquadmath-0.dll: käsku ei ole
libquadmath-0.dll: không tìm thấy lệnh
libquadmath-0.dll: komanda nerasta
libquadmath-0.dll: Kommando nicht gefunden.
libquadmath-0.dll: kommandot finns inte
libquadmath-0.dll: komut yok
libquadmath-0.dll: nie znaleziono polecenia
libquadmath-0.dll: níor aimsíodh an t-ordú
libquadmath-0.dll: no se encontró la orden
libquadmath-0.dll: no s'ha trobat l'ordre
libquadmath-0.dll: opdracht niet gevonden
libquadmath-0.dll: parancs nem található
libquadmath-0.dll: perintah tidak ditemukan
libquadmath-0.dll: príkaz nenájdený
libquadmath-0.dll: příkaz nenalezen
libquadmath-0.dll: команда не найдена
libquadmath-0.dll: командата не е открита
libquadmath-0.dll: 命令找不到
libquadmath-0.dll: コマンドが見つかりません