# Cmake not running on AIX 7.1,7.2

**URL:** https://discourse.cmake.org/t/cmake-not-running-on-aix-7-1-7-2/7989
**Category:** Usage
**Tags:** os:aix
**Created:** [April 26, 2023, 12:33pm UTC](https://discourse.cmake.org/t/cmake-not-running-on-aix-7-1-7-2/7989 "2023-04-26T12:33:28Z")
**Posts on this page:** 4
**Page:** 2

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### Author: ![MrGaryTaco](https://discourse.cmake.org/user_avatar/discourse.cmake.org/mrgarytaco/32/3696_2.png) [@MrGaryTaco](https://discourse.cmake.org/u/MrGaryTaco)
#### Post date: [August 10, 2023, 4:40pm UTC](https://discourse.cmake.org/t/cmake-not-running-on-aix-7-1-7-2/7989/21 "2023-08-10T16:40:52Z")

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Looks like I don’t have xlclang installed:

```auto
ls /usr/vacpp/bin/xlc*
/usr/vacpp/bin/xlc@ /usr/vacpp/bin/xlc++@
/usr/vacpp/bin/xlc++128@ /usr/vacpp/bin/xlc++128_r@
/usr/vacpp/bin/xlc++128_r4@ /usr/vacpp/bin/xlc++128_r7@
/usr/vacpp/bin/xlc++128core@ /usr/vacpp/bin/xlc++128core_r@
/usr/vacpp/bin/xlc++128core_r7@ /usr/vacpp/bin/xlc++_r@
/usr/vacpp/bin/xlc++_r4@ /usr/vacpp/bin/xlc++_r7@
/usr/vacpp/bin/xlc++core@ /usr/vacpp/bin/xlc++core_r@
/usr/vacpp/bin/xlc++core_r7@ /usr/vacpp/bin/xlc128@
/usr/vacpp/bin/xlc128_r@ /usr/vacpp/bin/xlc128_r4@
/usr/vacpp/bin/xlc128_r7@ /usr/vacpp/bin/xlc_r@
/usr/vacpp/bin/xlc_r4@ /usr/vacpp/bin/xlc_r7@

```

Is it difficult to install xlclang?

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<div class="post-metadata">

### Author: ![kyle.edwards](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/k/65b543/32.png) [@kyle.edwards](https://discourse.cmake.org/u/kyle.edwards)
#### Post date: [August 10, 2023, 4:42pm UTC](https://discourse.cmake.org/t/cmake-not-running-on-aix-7-1-7-2/7989/22 "2023-08-10T16:42:55Z")

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Looks like you’ll need v16.1 or later:

> **[A new Clang-based front end](https://www.ibm.com/docs/en/xl-c-and-cpp-aix/16.1?topic=new-clang-based-front-end)**
>
> IBM XL C/C++ for AIX, V16.1 introduces a new Clang-based front end in addition to the existing IBM legacy XL-based front end. For an explanation of the XL-based front end and the Clang-based front end, see A two-in-one compiler: Clang-based front end...

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<div class="post-metadata">

### Author: ![kyle.edwards](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/k/65b543/32.png) [@kyle.edwards](https://discourse.cmake.org/u/kyle.edwards)
#### Post date: [August 10, 2023, 4:43pm UTC](https://discourse.cmake.org/t/cmake-not-running-on-aix-7-1-7-2/7989/23 "2023-08-10T16:43:23Z")

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Alternatively, you may just want to use GCC to bootstrap CMake.

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<div class="post-metadata">

### Author: ![MrGaryTaco](https://discourse.cmake.org/user_avatar/discourse.cmake.org/mrgarytaco/32/3696_2.png) [@MrGaryTaco](https://discourse.cmake.org/u/MrGaryTaco)
#### Post date: [August 10, 2023, 5:49pm UTC](https://discourse.cmake.org/t/cmake-not-running-on-aix-7-1-7-2/7989/24 "2023-08-10T17:49:25Z")

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I have gcc 8.3.0 installed but not g++. I will look into installing clang v16.1 or g++. Thanks again for everyone’s suggestions!

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