My first time using this community, I had some issues with ubuntu18.04 building the sdk and was looking for help.
CMake Error at cmake/StdFilesystem.cmake:22 (message):
Toolchain doesn't support std::filesystem with nor without -lstdc++fs
Call Stack (most recent call first):
Just to be clear why we're asking...
"up to date" is vague. You could be running 22.03.5 release (the latest official stable release), or one back (21.02.7) which is still currently supported and maintained. You could also be using the release candidate of the next major release (23.05-RC1), or snapshot for any of these releases or even the snapshot from the main branch, and still be considered up-to-date. You could even be using the latest revision of an old and now EOL'd release if you considered that up-to-date. So, we need specifics or we cannot provide any useful guidance.
you are working with source code that is not from the official Openwrt project. It is a fork. All questions that arise while you are working with that code should be directed to the maintainers of that code (not here)
that code cannot be even remotely considered “up to date” because it is based on a version of OpenWrt (LEDE) that is 6 years old and 4 (almost 5) major revisions behind the current release.