Where is"libgccjit"?

[take@kasaneiro.jp]

To all participants in jit@gnu ml.

My name is Takeo Watanabe and I am sending you a mail from Japan.

I am trying to build native compiled Emacs on macOS.
I also want to build from source as much as possible, do not use
Homebrew.

So far, I have completed building libxml2 and gcc12.1.
I have not been able to find libgccjit either in the archive or in git,
and I have not been able to find it in the git file.
I have not been able to find it in archive or git yet.

If anyone knows where I can find it, please let me know.
Please let me know. Thank you in advance.

best regards.
---
WATANABE, Takeo
take@kasaneiro.jp