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I decided to try playing with Crystal to check its speed and compatibility relative to Ruby. I downloaded the pre-built .pkg installer to my macOS Sierra system. My small test programs appear to run, but all produce the following message:

$ crystal --version
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
Crystal 0.19.4 [7f82f79] (2016-10-07)
$

I suspect an incompatibility with Sierra, or an out-of-date or missing library. Does anybody know what the fix is? It's annoying, but is it also potentially hazardous?

pjs
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1 Answers1

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I had a similar issue.

try reinstalling libevent

brew update
brew reinstall libevent
brew reinstall crystal-lang

This is the link that helped me out https://github.com/Homebrew/homebrew-core/issues/2869

vonKingsley
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  • Thanks for the response. I'm not a fan of homebrew, and was using the pre-built crystal binary to avoid having to do a brew-based install. – pjs Nov 08 '16 at 22:28