From: Hans Mackowiak <hanmac@...>
Date: 2011-04-20T21:18:13+09:00
Subject: Re: Calling a custom Ruby C extension method from other C extension

method 1:

in your my-exten use "extern String_headerize( args );"
and then you must  require your string lib before yours

method 2:

if you not need the directly C method you chould use 
rb_funcall(string,rb_intern(headerize),args ...);

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