I have been trying to build Hydra for my iBook using Darwinports. Since the MD5 sums didn't seem to match, I decided to go ahead and just update the port to use Hydra 4.7, as the latest supported was 4.6. One complication is that in order to support SSH v2 testing, Hydra requires libssh 0.11, so I had to update the libssh port at the same time. These patches have been contributed to the maintainers, but in the meantime you can get the port files for them here - Hydra 4.7 and Libssh 0.11.
Just extract these to your port files directory for both apps, and install using the port command. The port files are found on my box at /opt / local / var / db / dports / sources / rsync.rsync.opendarwin.org_dpupdate_dports. Hydra is in security/hydra and libssh is in devel/libssh.
Here is the GTK interface xhydra running on OS X:

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