# Redhat: Compilers that do not support bool are not supported

**URL:** https://discourse.itk.org/t/redhat-compilers-that-do-not-support-bool-are-not-supported/1474
**Category:** Engineering
**Created:** [December 13, 2018, 4:50pm UTC](https://discourse.itk.org/t/redhat-compilers-that-do-not-support-bool-are-not-supported/1474 "2018-12-13T16:50:50Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Kim\_Han\_Thung](https://discourse.itk.org/letter_avatar_proxy/v4/letter/k/b5e925/32.png) [@Kim\_Han\_Thung](https://discourse.itk.org/u/Kim_Han_Thung)
#### Post date: [December 13, 2018, 4:50pm UTC](https://discourse.itk.org/t/redhat-compilers-that-do-not-support-bool-are-not-supported/1474/1 "2018-12-13T16:50:51Z")

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Hi all, I encountered the following error when trying to build ITK.

> CMake Error at Modules/ThirdParty/VNL/src/vxl/config/cmake/config/VXLIntrospectionConfig.cmake:391 (message):  
> Compilers that do not support bool are not supported  
> Call Stack (most recent call first):  
> Modules/ThirdParty/VNL/src/vxl/CMakeLists.txt:183 (include)

My system: Redhat  
Steps:

1. download and unzip InsightToolkit-4.13.1.
2. create ITK-build in InsightToolkit folder.
3. Go to the ITK-build folder, and run  
ccmake3 …/
4. press ‘c’
5. the above error occurred,

- UPDATE: the error above disappear after I remove all the files in ITK-build and run ‘ccmake3 …/’ again. So, problem solved. Thanks.

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### Author: ![fbudin](https://discourse.itk.org/user_avatar/discourse.itk.org/fbudin/32/14_2.png) [@fbudin](https://discourse.itk.org/u/fbudin)
#### Post date: [December 13, 2018, 5:42pm UTC](https://discourse.itk.org/t/redhat-compilers-that-do-not-support-bool-are-not-supported/1474/2 "2018-12-13T17:42:20Z")

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Hello,

Could you be more specific about your system? What version of Redhat do you have? What compiler (and version) are you using?

Thanks!