# C++ extension failing to build

**URL:** https://forum.makecode.com/t/c-extension-failing-to-build/1994
**Category:** PXT
**Created:** [May 7, 2020, 3:22pm UTC](https://forum.makecode.com/t/c-extension-failing-to-build/1994 "2020-05-07T15:22:05Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![luqmaanb](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/luqmaanb/32/504_2.png) [@luqmaanb](https://forum.makecode.com/u/luqmaanb)
#### Post date: [May 7, 2020, 3:22pm UTC](https://forum.makecode.com/t/c-extension-failing-to-build/1994/1 "2020-05-07T15:22:05Z")

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C++ build is not compiling on both microbit and maker.

 ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/1X/ee79ea065dc9bff0d64b59bf2fc52929ca2b2c1d.png)  
It continues to poll indefinitely.

To replicate the issue:

- `mkdir test`
- `cd test`
- `pxt init`
- `pxt add cpp`
- `pxt build`

Please provide assistance on the matter.

---

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### Author: ![richard](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/richard/32/5417_2.png) [@richard](https://forum.makecode.com/u/richard)
#### Post date: [May 7, 2020, 5:56pm UTC](https://forum.makecode.com/t/c-extension-failing-to-build/1994/2 "2020-05-07T17:56:32Z")

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Try again! It should be fixed now.