# installing capybara-webkit on Catalina via Monitor wiki
brew update
cd $(brew --prefix)/Homebrew/Library/Taps/homebrew/homebrew-core
git show 9ba3d6ef8891e5c15dbdc9333f857b13711d4e97 > /dev/null || git fetch --unshallow
git checkout 9ba3d6ef8891e5c15dbdc9333f857b13711d4e97 Formula/qt@5.5.rb
type -a gsed || brew install gnu-sed
gsed -i 's/depends_on :macos => :mountain_lion//' Formula/qt@5.5.rb
brew install qt@5.5
# now gem install capybara-webkit -v '1.15.1' will work