The Sqitch Homebrew Tap quickly builds Sqitch on your Mac. To install from Homebrew, configure the tap and then install the variants you need via the appropriate --use-$engine-support options. For example, to install Sqitch with PostgreSQL and SQLite support:

brew tap sqitchers/sqitch
brew install sqitch --with-postgres-support --with-sqlite-support

Some engines require the installation of dependencies in advance; consult the docs for build details and options.