This is a very odd list of platforms. Why does it only build on these two specific ones?

These are the only two platforms that I am able to test (my dev laptop and my embedded target board).

This patch has a lot of changes, and they aren't documented. Why is this patch needed here in Yggdrasil, and will you send it upstream so we don't have to try keeping it updated when a new version is introduced?

That's a fair question. I probably should have split the patch up to make the purpose of the different parts more obvious.

Here is a summary:

CMakeLists.txt and custom.cmake -- This is cmake configuration to build LVGL as shared libraries and using the SDL2 backend (based on the example here).

lv_conf_template.h -- This is build configuration to enable SDL2 integration (based on the example here)

lv_font.[ch] -- This is an access function to allow access to const struct font definitions. As far as I know, Libdl does not provide a way to access a const struct defined in a dynamic library (dlsym only returns function pointers). This access function is probably not interesting to the upstream project. I assume they are focused on supporting users who are accessing the library from C.

Has this been sent upstream? I would guess we aren't the only ones seeing this issue.

I doubt anyone else would be using the very old (2016) version of the MacOS system headers that are used by BinaryBuilder.jl
So, this isn't suitable to send upstream. It's just a hack to build using Yggdrasil's outdated cross compiler setup.