From: Brian Candler <b.candler@...>
Date: 2009-08-12T20:43:44+09:00
Subject: Re: Readline not working with Ruby

Stewart wrote:
> makes me wonder how ruby was compiled with readline in the first palce.

C is a tolerant language, from its K&R heritage. Calling a function 
which has not been declared will only give a warning, not an error 
(although gcc has a flag to turn this into an error)

That warning only becomes a hard error at link time, if the linker tries 
to find the named function and fails.
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