# vc143, detected vc142
**URL:** https://discourse.cmake.org/t/vc143-detected-vc142/5345
**Category:** Usage
**Tags:** os:windows
**Created:** [March 31, 2022, 9:43am UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345 "2022-03-31T09:43:26Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@alice](https://discourse.cmake.org/u/alice)
#### Post date: [March 31, 2022, 9:43am UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345/1 "2022-03-31T09:43:26Z")
what does it mean?
vc143, detected vc142
```auto
Found package configuration file:
1> [CMake]
1> [CMake] D:/TEST/boost/debug/lib/cmake/boost_system-1.78.0/boost_system-config.cmake
1> [CMake]
1> [CMake] but it set boost_system_FOUND to FALSE so package "boost_system" is
1> [CMake] considered to be NOT FOUND. Reason given by package:
1> [CMake]
1> [CMake] No suitable build variant has been found.
1> [CMake]
1> [CMake] The following variants have been tried and rejected:
1> [CMake]
1> [CMake] * boost_system-vc143-mt-gd-x64-1_78.lib (vc143, detected vc142, set
1> [CMake] Boost_COMPILER to override)
1> [CMake]
1> [CMake] * libboost_system-vc143-mt-gd-x64-1_78.lib (vc143, detected vc142, set
1> [CMake] Boost_COMPILER to override)
1> [CMake]
1> [CMake] * libboost_system-vc143-mt-sgd-x64-1_78.lib (vc143, detected vc142, set
1> [CMake] Boost_COMPILER to override)
1> [CMake]
1> [CMake] Call Stack (most recent call first)
```
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [March 31, 2022, 2:07pm UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345/2 "2022-03-31T14:07:00Z")
It means that your Boost was compiled with a v143 toolchain, but you’re using a v142 toolchain. This combination is not supported. You’ll need to use the same compiler for Boost and your project.
---
### Author:  [@alice](https://discourse.cmake.org/u/alice)
#### Post date: [March 31, 2022, 2:19pm UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345/3 "2022-03-31T14:19:25Z")
what is the command to define vc142?
cmake -G generator?
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [March 31, 2022, 2:24pm UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345/4 "2022-03-31T14:24:08Z")
It’s more about the toolchain than the generator. I think v142 is the default VS2019 toolchain.
---
### Author:  [@alice](https://discourse.cmake.org/u/alice)
#### Post date: [March 31, 2022, 2:38pm UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345/5 "2022-03-31T14:38:33Z")
> [@ben.boeckel](#):
>
> v143
v143 is vs2020 ?
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [March 31, 2022, 2:44pm UTC](https://discourse.cmake.org/t/vc143-detected-vc142/5345/6 "2022-03-31T14:44:13Z")
VS2022; Visual Studio releases every 2-3 years.