python app not seeing libraries in Gnome Platform

[Scott Mackay]

Hello,

I hope this is the right place to ask.  I volunteer on packaging Gramps 
as a flatpak for the gramps-project.  It is a python3 app, but the 
flatpak app is not seeing the Gnome Platform 3.38 libraries that I know 
are in the platform.  (Gramps has an optional add-on that checks 
prerequisites.)  Examples of prerequisites that are in Gnome Platform 
but not seen by Gramps flatpak are librsvg, xdg-utils, language pack, 
enchant, etc.  I have found the libraries installed in my system through 
the flathub installed platform at 
/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/3.38/62763751ad7e5c0dd029a716115a4f9618b7a14a4ec6e7618c1db0105800357f/files/lib/x86_64-linux-gnu/ 
but it looks to me like that directory will change each time it gets 
installed depending on the computer and whether it is system or user 
wide.  Gramps itself is installed in the .yml manifest with the command

- python3 setup.py install --prefix=/app --exec-prefix=/bin

and I suspect that I need to add something to that command to have 
Gramps see the platform libraries, but I haven't figured it out yet.  
Does anyone know how to have python see the Platform libraries?

The .yml manifest for my fork of the flatpak for gramps-project is at 
https://github.com/OzarkShepherd/flatpak/blob/main/org.gramps_project.Gramps.yml 
and you can see there are other dependencies I manually added and that 
can be taken out once I see how to link to the Platform libraries with 
the simple buildsystem and a python3 command.

Thank you,

Scott

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