click here to download the bzImage of the kernel. I also made a very minimal initramfs which prints 'Hello' over and over again so it can be run in qemu. To run everything in qemu, run qemu-system-x86_64 -kernel bzImage -initrd initramfs.cpio -append "root=/dev/ram init=/init"
I also wrote a longer explanation of how I compiled this kernel from my mac. You can find it here, but it's fairly long and written in plaintext markdown.