Link against MacPorts Ruby instead of system Ruby

[Kevin Walzer]

On 4/26/14, 1:38 PM, Brandon Allbery wrote:
>
> It may link successfully but lead to obscure core dumps at runtime, if
> you're mixing the system ruby headers with a different ruby
> installation's libraries.

I understand that, but I am still not clear on how to pick up the 
MacPorts headers completely. The invocation Chris provided does not build.

--Kevin

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Kevin Walzer
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