# There are no extensions in the extension manager-5.3.0 build

**URL:** <https://discourse.slicer.org/t/there-are-no-extensions-in-the-extension-manager-5-3-0-build/28394>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [March 15, 2023, 8:43am UTC](https://discourse.slicer.org/t/there-are-no-extensions-in-the-extension-manager-5-3-0-build/28394 "2023-03-15T08:43:01Z")\
**Posts on this page:** 1\
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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [March 15, 2023, 12:20pm UTC](https://discourse.slicer.org/t/there-are-no-extensions-in-the-extension-manager-5-3-0-build/28394/3 "2023-03-15T12:20:11Z")

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Factory built extensions are only available for specific revision numbers corresponding to the commit used for the nightly build of extensions each night. However since you have built Slicer from source you cannot expect factory built extensions to appropriately work due to ABI compatibility issues. Therefore you should build the extensions you need from source as well. As a reminder you don’t generally need to build Slicer or extensions from source if they are Slicer scripted loadable modules which are written in python.

> [@Extensions are not working when building Slicer from scratch](https://discourse.slicer.org/t/extensions-are-not-working-when-building-slicer-from-scratch/8412/2):
>
> You cannot use factory-built extensions with your locally built Slicer. In that case you’ll need to clone and build the extensions you want to use. See also for example or

How to build extensions from source:

[https://slicer.readthedocs.io/en/latest/developer\_guide/extensions.html#build-an-extension](https://slicer.readthedocs.io/en/latest/developer_guide/extensions.html#build-an-extension)

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_[View the full topic](https://discourse.slicer.org/t/there-are-no-extensions-in-the-extension-manager-5-3-0-build/28394)._