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I recently explored the Emacs Mac Port developed by Yamamoto Mitsuharu. It feels great and I would like to try using it instead of vanilla GNU Emacs. However, I have some code in my init files which is incompatible with the Mac Port version. I would like to know how to conditionally disable this code.

I'm essentially looking for something like this:

(unless (boundp 'emacs-mac-port-version)
  ;; do this stuff only in vanilla Emacs
)

So how can I detect that I am on the Emacs Mac Port from Elisp?

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    I think window-system will be 'mac instead of 'ns, but I haven't compared to all the different mac versions of emacs yet. – amitp Dec 29 '17 at 1:12
  • @amitp You are correct! That seems to work for my purposes. If you post it as an answer, I will accept it. – GDP2 Dec 29 '17 at 1:32
  • Or (boundp 'mac-carbon-version-string), its emacs-version uses this: bitbucket.org/mituharu/emacs-mac/src/…, it works for both terminal and GUI. – xuchunyang Dec 29 '17 at 5:47
  • @xuchunyang Hmm, interesting. Thanks for the tip. – GDP2 Dec 29 '17 at 6:09
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As amitp said in the comments, the window-system variable is 'mac on the Mac Port. Also, as pointed out by xuchunyang, emacs-version yields special output and mac-carbon-version-string is bound.

These things alone should be enough for one to detect whether you're using the Emacs Mac Port, even in a terminal frame.

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