# Trouble installing cmdstan with cmdstanpy

**URL:** <https://discourse.mc-stan.org/t/trouble-installing-cmdstan-with-cmdstanpy/20952>\
**Category:** Modeling\
**Created:** [February 23, 2021, 6:54pm UTC](https://discourse.mc-stan.org/t/trouble-installing-cmdstan-with-cmdstanpy/20952 "2021-02-23T18:54:19Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ahartikainen](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/ahartikainen/32/321_2.png) [@ahartikainen](https://discourse.mc-stan.org/u/ahartikainen)\
**Post date:** [February 23, 2021, 7:17pm UTC](https://discourse.mc-stan.org/t/trouble-installing-cmdstan-with-cmdstanpy/20952/2 "2021-02-23T19:17:32Z")

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Did you try this solution? (You probably did?)

> [@Compiling error after upgrading to MacOS Big Sur](https://discourse.mc-stan.org/t/compiling-error-after-upgrading-to-macos-big-sur/19309/5):
>
> `sudo rm -rf /Library/Developer/CommandLineTools`  
> `xcode-select --install`

> [@Compiling error after upgrading to MacOS Big Sur](https://discourse.mc-stan.org/t/compiling-error-after-upgrading-to-macos-big-sur/19309/5):
>
> Spot on diagnosis! Thank you! Doing the following as it’s suggested in the link you sent: sudo rm -rf /Library/Developer/CommandLineTools xcode-select --install then a clean installation of Anaconda and PyStan solved the issue. Thank you so much!

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