~$ brew --version
Homebrew 2.1.15
Homebrew/homebrew-core (git revision b203; last commit 2019-10-24)
Homebrew/homebrew-cask (git revision 65494; last commit 2019-10-24)

~/Documents/gerrit/releng/local-charts$ make install
(cd ./bin && ./install_prereqs.sh)
Ensuring homebrew caskroom is installed...
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
No changes to formulae.

Error: caskroom/cask was moved. Tap homebrew/cask-cask instead.
make: *** [install] Error 1