# Windows configure error when using the command line: "The C/CXX compiler identification is unknown.."

**URL:** https://discourse.cmake.org/t/windows-configure-error-when-using-the-command-line-the-c-cxx-compiler-identification-is-unknown/4053
**Category:** Usage
**Created:** [September 8, 2021, 9:47am UTC](https://discourse.cmake.org/t/windows-configure-error-when-using-the-command-line-the-c-cxx-compiler-identification-is-unknown/4053 "2021-09-08T09:47:50Z")
**Posts on this page:** 1
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### Author: ![hsattler](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/h/59ef9b/32.png) [@hsattler](https://discourse.cmake.org/u/hsattler)
#### Post date: [September 8, 2021, 12:05pm UTC](https://discourse.cmake.org/t/windows-configure-error-when-using-the-command-line-the-c-cxx-compiler-identification-is-unknown/4053/2 "2021-09-08T12:05:58Z")

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Guessing: The cmake-gui chooses the 32bit (host and target) version of the compiler. You choose the host=64bit version with CLI

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_[View the full topic](https://discourse.cmake.org/t/windows-configure-error-when-using-the-command-line-the-c-cxx-compiler-identification-is-unknown/4053)._