brew info hydra shows:
hydra: stable 8.1 (bottled), HEAD https://www.thc.org/thc-hydra/ Not installed From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/hydra.rb ==> Dependencies Build: pkg-config ✔ Required: openssl ✔ Optional: subversion ✘, libidn ✘, libssh ✘, pcre ✔, gtk+ ✔ ==> Options --with-gtk+ Build with gtk+ support --with-libidn Build with libidn support --with-libssh Build with libssh support --with-pcre Build with pcre support --with-subversion Build with subversion support --HEAD Install HEAD version To allow ssh support, install using command:
brew install hydra --with-libssh It is always a good idea to use brew info before running brew install