# What is the correct combo for Anaconda and Cylc on RHEL 8

**URL:** <https://cylc.discourse.group/t/what-is-the-correct-combo-for-anaconda-and-cylc-on-rhel-8/693>\
**Category:** Cylc Support\
**Created:** [July 12, 2023, 5:26pm UTC](https://cylc.discourse.group/t/what-is-the-correct-combo-for-anaconda-and-cylc-on-rhel-8/693 "2023-07-12T17:26:57Z")\
**Posts on this page:** 1\
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**Author:** ![hilary.j.oliver](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/hilary.j.oliver/32/4_2.png) [@hilary.j.oliver](https://cylc.discourse.group/u/hilary.j.oliver)\
**Post date:** [July 12, 2023, 10:25pm UTC](https://cylc.discourse.group/t/what-is-the-correct-combo-for-anaconda-and-cylc-on-rhel-8/693/2 "2023-07-12T22:25:23Z")

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You need to use the much faster mamba environment solver, with conda.

> [@\[Cylc 8 - cylc-uiserver\] Stuck at building dependencies when try to install cylc-uiserver via pip / conda](https://cylc.discourse.group/t/cylc-8-cylc-uiserver-stuck-at-building-dependencies-when-try-to-install-cylc-uiserver-via-pip-conda/621/2):
>
> We recommend using mamba rather than conda (which is getting increasingly slow), see [https://cylc.discourse.group/t/trouble-installing-cylc-8-1-0/584/2](https://cylc.discourse.group/t/trouble-installing-cylc-8-1-0/584/2). For installation on systems without internet access we use [conda pack](https://conda.github.io/conda-pack/). conda pack --dest-prefix=/path/to/cylc -o packed-env.tgz The --dest-prefix option specifies the path to where cylc will be installed on the destination platform and avoids any need to “unpack” after untarring. [https://conda.github.io/conda-pack/cli.html](https://conda.github.io/conda-pack/cli.html) We use conda pack …

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