Opening this on behalf of thomas@devoogdt.com

See:

https://mail.openjdk.org/pipermail/client-libs-dev/2025-November/033701.html

<quote>
I'm trying to compile OpenJDK in headless mode without the required X11 libraries. This becomes more common in embedded systems, where e.g. no head is used at all, or where e.g. only wayland is available.

For this, I proposed a patch in buildroot, see
https://patchwork.ozlabs.org/project/buildroot/patch/20251115154030.1746780-1-thomas@devoogdt.com/

Buildroots policy is to upstream any custom patch when applicable, for which I created
https://github.com/openjdk/jdk/pull/28310
</quote>