The header mismatch seems like a dependency Buildroot could check to prevent hidden time bugs where the kernel/glibc are all good(kernel 5.6+ and Glibc 2.32+), but someone uses old toolchain headers < 5.6 resulting in the application using a 32bit timespec at runtime. https://stackoverflow.com/questions/14361651/is-there-any-way-to-get-64-bit-time-t-in-32-bit-programs-in-linux/60709400#60709400
Thank you for your report. The issue tracker for the Buildroot project has been moved to the Gitlab.com issue tracker: https://gitlab.com/buildroot.org/buildroot/-/issues We are taking this opportunity to close old issues in this old tracker. If you believe your issue is still relevant, please open one in the new issue tracker. Thank you!