MinGW, a contraction of "Minimalist GNU for Windows", is a minimalist development environment for native Microsoft Windows applications.
MSYS, a contraction of "Minimal SYStem", is a Bourne Shell command line interpreter system. Offered as an alternative to Microsoft's cmd.exe, this provides a general purpose command line environment, which is particularly suited to use with MinGW, for porting of many Open Source applications to the MS-Windows platform; a light-weight fork of Cygwin-1.3, it includes a small selection of Unix tools, chosen to facilitate that objective.
MYSY2 是因为内部包含了 mingw 和 pacman 包管理器{installdir}/msys32/mingw32/bin 添加到环境变量pacman参考 MSYS2 镜像使用帮助 编辑 /etc/pacman.d/mirrorlist.mingw32 ，在文件开头添加：
Server = https://mirrors.tuna.tsinghua.edu.cn/msys2/mingw/i686
然后执行 pacman -Sy 刷新软件包数据即可
有了 pacman 我们可以非常简单的管理包
pacman -Ss {name} 查找需要安装包的名称pacman -S {name1} {name2} {name3} 安装单个或单个包常用编译包 pcre-devel openssl-devel gcc curl mingw32-make wget g++
pacman -S mingw-w64-i686-gcc mingw-w64-i686-make mingw-w64-i686-gdb mingw-w64-i686-wget mingw-w64-i686-gcc-fortran mingw-w64-i686-curl openssl-devel pcre-devel msys/openssh