MSYS2 + MinGW 環境に SDL2 をインストール

検証環境 Windows10 Home Edition msys2-x86_64-20170918 $ gcc --version gcc.exe (Rev2, Built by MSYS2 project) 7.2.0 Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PART…