# Pytensor g++ not detected

**URL:** <https://discourse.pymc.io/t/pytensor-g-not-detected/13021>\
**Category:** v5\
**Created:** [September 29, 2023, 4:28pm UTC](https://discourse.pymc.io/t/pytensor-g-not-detected/13021 "2023-09-29T16:28:06Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![aakhmetz](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/aakhmetz/32/1500_2.png) [@aakhmetz](https://discourse.pymc.io/u/aakhmetz)\
**Post date:** [September 30, 2023, 10:27am UTC](https://discourse.pymc.io/t/pytensor-g-not-detected/13021/13 "2023-09-30T10:27:52Z")

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Hi, I just posted the same issue in another thread: [Install pymc issues - #6 by aakhmetz](https://discourse.pymc.io/t/install-pymc-issues/12288/6)

I downgraded the numpy to 1.25.2 and it solved the issue. Could you please check if it would work for you?

```auto
pip install numpy==1.25.2

```

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