<sys/sysctl.h> will disappear from rawhide glibc soon
This follows the removal of the system call from Linux 5.5. Having the
header and function just confuses configure checks that assume that if
the function is present, it will do something useful (it never did on
aarch64, and it's been many years since it worked on Fedora kernels on
other architectures).
Replacements are uname, getentropy, and reading from /proc, but I really
do not expect much fallout from this (famous last words).
The kernel headers still provide <linux/sysctl.h>, but that will
eventually disappear as well.
Thanks,
Florian