I noticed that Lua support is not enabled in the build, which means it's currently not possible to use plugins in the Flatpak build. :cry:
$ flatpak run org.darktable.Darktable --version
this is darktable 2.6.2
copyright (c) 2009-2019 johannes hanika
darktable-dev@lists.darktable.org
compile options:
bit depth is 64 bit
normal build
SSE2 optimized codepath enabled
OpenMP support enabled
OpenCL support enabled
Lua support disabled
Colord support enabled
gPhoto2 support enabled
GraphicsMagick support enabled
OpenEXR support enabled
Firstly: Thanks for Darktable as a Flatpak!
I noticed that Lua support is not enabled in the build, which means it's currently not possible to use plugins in the Flatpak build. :cry: