On Mac OSX using Homebrew

To easily install Crystal on Mac you can use Homebrew.

brew update
brew install crystal

If you're planning to contribute to the language itself you might find useful to install LLVM as well. So replace the last line with:

brew install crystal --with-llvm

Troubleshooting on OSX 10.11 (El Capitan)

If you get an error like:

ld: library not found for -levent

you need to reinstall the command line tools and then select the default active toolchain:

$ xcode-select --install
$ xcode-select --switch /Library/Developer/CommandLineTools

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