I can confirm the build works flawlessly, without any of these hacks if you use version 2.69 of autoconf, on MacOs BigSur, both intel and M1. This is also the preferred way proposed by the erlang team.
To install the downgraded version you can use
brew install cjntaylor/personal/autoconf@2.69
brew unlink autoconf
brew link autoconf@2.69
asdf install erlang 24.0
