# SlicerRT built from source cannot start

**URL:** https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792
**Category:** Support
**Tags:** build
**Created:** [July 21, 2025, 8:52am UTC](https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792 "2025-07-21T08:52:11Z")
**Posts on this page:** 1
**Showing post:** 12

<div class="post-metadata">

### Author: ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)
#### Post date: [July 22, 2025, 8:26am UTC](https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792/12 "2025-07-22T08:26:23Z")

</div>

> [@chir.set](#):
>
> `+locale.setlocale(locale.LC_ALL, locale.getdefaultlocale())`

Update:

With this hack, Slicer starts but files are badly read (NRRD, DICOM…).

This fix yields a functional Slicer:

`locale.setlocale(locale.LC_ALL, "C.UTF-8")`

**NOTE** : this is just a temporary hack for my Linux build at the moment. It should not be needed at all and things should bet back to normal when the library/toolkit/infrastructure upgrade phase is over.

---

_[View the full topic](https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792)._