pure 0.64 (new formula)

[harmeling]

All Submissions:

• [x ] Have you followed the guidelines in our Contributing document?

New Formulae Submissions:

• [x ] Does your submission pass
  brew audit --strict --online <formula> (where <formula> is the name of the formula you're submitting)?
• [x ] Have you built your formula locally prior to submission with brew install <formula>?

Formulae Updates/Changes:

• If your changes include a new patch have you submitted the patch upstream & included a brief explanation/link to the upstream submission in the formula?

Changes to Homebrew's Core:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable? Here's an example if you'd like one.
• Have you successfully ran brew tests with your changes locally?

only issue: wasn't sure how to set the elispdir

[dunn]

Formulae in core aren't allowed to depend on taps; this is why Pure was removed in #39218.

[dunn]

Until Pure can build against the current LLVM (please nudge the upstream developers 😸 ), I'm afraid we're going to ask you to maintain this in your own tap: https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/How-to-Create-and-Maintain-a-Tap.md

Sorry!