How to add a formula for libavif?

[y-a-v-a]

Hi I'm using brew for several years now, for several projects.
I was wondering what steps one would have to make to add a formula for libavif: https://github.com/AOMediaCodec/libavif as there doesn't seem to be one yet.
I would like to have this formula in order to extend the libgd2 formula (named gd: https://github.com/Homebrew/homebrew-core/blob/2badf0f3f0bdf0ad5dbaa3c33462c6caa5a65d4a/Formula/gd.rb) so I can make use of libavif in the latest version of libgd2 (2.3.2).
Also, formula gd could be extended with the use of libheif ( https://github.com/Homebrew/homebrew-core/blob/1a68145a11b216a5fbbbf2bf1cc84dba9679f3ba/Formula/libheif.rb ).

Cheers Vincent - trying to maintain https://github.com/y-a-v-a/node-gd

[nandahkrishna]

You could create a pull request to add the formula. Here are some docs to help you get started:

• Contributing Guide
• Formula Cookbook
• How to open a Homebrew PR