I've seen it mentioned several times to fix issues with some packages, that it installs newer versions of packages somehow. But I've been unable to find a clear explanation of what that option really does, when to use it, why some packages have a –HEAD version to install and why its necessary.
What does “brew –HEAD” mean
homebrew
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Best Answer
I found some information in the Homebrew docs.
Quoting from under the "Advanced Formula Tricks" section:
Hopefully this helps with the what. I can't help with the why.