# MSYS2 MINGW64\_NT System is unknown to cmake

**URL:** https://discourse.cmake.org/t/msys2-mingw64-nt-system-is-unknown-to-cmake/6035
**Category:** Usage
**Tags:** os:windows
**Created:** [July 8, 2022, 5:06pm UTC](https://discourse.cmake.org/t/msys2-mingw64-nt-system-is-unknown-to-cmake/6035 "2022-07-08T17:06:08Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![bradbell](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/b/e95f7d/32.png) [@bradbell](https://discourse.cmake.org/u/bradbell)
#### Post date: [July 8, 2022, 5:06pm UTC](https://discourse.cmake.org/t/msys2-mingw64-nt-system-is-unknown-to-cmake/6035/1 "2022-07-08T17:06:08Z")

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I am using a modified version the following suggestion for a msys2 environment on github:

> **[MSYS2 - Using MSYS2 in CI](https://www.msys2.org/docs/ci/)**
>
> There are many ways to use MSYS2 in CI. The recommended way is Github Actions.

I get the following message during my cmake command:

System is unknown to cmake, create:  
Platform/MINGW64\_NT-10.0-20348 to use this system, please post your config file on [discourse.cmake.org](http://discourse.cmake.org) so it can be added to cmake

What does this message mean ?

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### Author: ![brad.king](https://discourse.cmake.org/user_avatar/discourse.cmake.org/brad.king/32/11_2.png) [@brad.king](https://discourse.cmake.org/u/brad.king)
#### Post date: [July 18, 2022, 6:15pm UTC](https://discourse.cmake.org/t/msys2-mingw64-nt-system-is-unknown-to-cmake/6035/2 "2022-07-18T18:15:56Z")

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See [this discussion](https://discourse.cmake.org/t/4521).