Going back to my earlier post. Did you download the zip file?
https://my.pcloud.com/publink/show?code=...YfVHipXQWV
That contains the normalmap plugin, which you now have in your Gimp 2.10 profile.
Also contains seven files
libgtkglext-x11-1.0.so.0 libgdkglext-x11-1.0.so.0 libGLEW.so.1.13 libGLEW.so.2.0 libGLU.so.1 libpangox-1.0.so.0 libXmu.so.6
Go in the org.gnome runtime, in the
../files/lib folder. I think you installed a load of files there before for the gmic_gimp_gtk plugin, it is the same place. You will need to open a file manager as root for this.
/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/3.28/f5..long..string..of..numbers..6d8/files/lib
Quote:Is that how you figured out how to get it working, by running Gimp in a terminal and reading the error msg's?
Exactly how I do it, normalmap a bit more difficult than others, All the files come from 'buntu 16.04, you need the actual binaries, not symbolic links so some renaming (already done in the zip) is needed.
The snag is I now have quite a few 'extra' lib files for various plugins, gmic, nufraw ..etc so my flatpak installation will behave a little different from a 'vanilla' one, Installing all those files for gmic, should go a long way.
edit: I thought you were using Mint, if you are using a redhat based distro, amazed that anything works.