➜ brew install kr
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
No changes to formulae.
Warning: You are using macOS 10.15.
We do not provide support for this pre-release version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Discourse, Twitter or IRC. You are responsible for resolving any issues you
experience, as you are running this pre-release version.
==> Installing kr from kryptco/tap
==> Cloning https://github.com/kryptco/kr.git
Updating /Users/daniel/Library/Caches/Homebrew/kr--git
==> Checking out tag 2.4.13
HEAD is now at fc57584 bump version
HEAD is now at fc57584 bump version
Entering 'sigchain'
Synchronizing submodule url for 'libsodium'
Synchronizing submodule url for 'openssl'
Entering 'sigchain/libsodium'
Entering 'sigchain/openssl'
/Users/daniel/Library/Caches/Homebrew/kr--git/sigchain
/Users/daniel/Library/Caches/Homebrew/kr--git/sigchain/libsodium
/Users/daniel/Library/Caches/Homebrew/kr--git/sigchain/openssl
Error: An exception occurred within a child process:
NoMethodError: undefined method `prefer_64_bit?' for OS::Mac:Module