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Lean for Windows

A native Lean binary for Windows can be generated using msys2. It is easy to install all dependencies, it produces native 64/32-binaries, and supports a C++11 compiler.

Installing dependencies

The official webpage of msys2 provides one-click installers. We assume that you install msys2 at c:\msys64. It has a package management system, pacman, which is used in Arch Linux - you must use this to update msys2 and install all of Lean's dependencies. The Lean build that's used in CI currently uses this set of commands (in any of the many installed msys shells):

pacman -Syu

And then, after restarting the shell:

pacman -Su
pacman -S --needed --overwrite * base-devel mingw-w64-x86_64-gcc mingw-w64-x86_64-gmp make mingw-w64-x86_64-cmake cmake git

Then follow the generic build instructions in the msys mingw shell, but make sure to append -DINCLUDE_MSYS2_DLLS=ON -G Unix\ Makefiles to the cmake commands.

Install lean

You can use the install ninja/make target to install Lean into, by, default, C:\\User Programs (x86)\\LEAN. To change this, add -DCMAKE_INSTALL_PREFIX=path/you/want to your cmake invocation.