To easily install Crystal on Mac you can use Homebrew.
brew update brew install crystal
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
If you get an error like:
ld: library not found for -lssl (this usually means you need to install the development package for libssl)
you may need to install OpenSSL and link pkg-config to OpenSSL:
brew install openssl
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/opt/openssl/lib/pkgconfig
As with other keg-only formulas there are some caveats shown in brew info <formula> that shows how to link pkg-config with this library.
The Crystal compiler will by default use pkg-config to find the locations of libraries to link with.
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https://crystal-lang.org/docs/installation/on_mac_osx_using_homebrew.html