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## JPEG XL GDK Pixbuf
The plugin may already have been installed when following the instructions from the
[Installing section of BUILDING.md](../../BUILDING.md#installing), in which case it should
already be in the correct place, e.g.
```/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-jxl.so```
Otherwise we can copy it manually:
```bash
sudo cp $your_build_directory/plugins/gdk-pixbuf/libpixbufloader-jxl.so /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-jxl.so
```
Then we need to update the cache, for example with:
```bash
sudo /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders --update-cache
```
In order to get thumbnails with this, first one has to add the jxl MIME type, see
[../mime/README.md](../mime/README.md).
Ensure that the thumbnailer file is installed in the correct place,
`/usr/share/thumbnailers/jxl.thumbnailer` or `/usr/local/share/thumbnailers/jxl.thumbnailer`.
The file should have been copied automatically when following the instructions
in the [Installing section of README.md](../../README.md#installing), but
otherwise it can be copied manually:
```bash
sudo cp plugins/gdk-pixbuf/jxl.thumbnailer /usr/local/share/thumbnailers/jxl.thumbnailer
```
Update the Mime database with
```bash
update-mime --local
```
or
```bash
sudo update-desktop-database
```
Then possibly delete the thumbnail cache with
```bash
rm -r ~/.cache/thumbnails
```
and restart the application displaying thumbnails, e.g. `nautilus -q` to display thumbnails.