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/usr/include/ruby-2.3.0/ruby/backward/rubyio.h is in ruby2.3-dev 2.3.0-5ubuntu1.

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#if   defined __GNUC__
#warning use "ruby/io.h" instead of "rubyio.h"
#elif defined _MSC_VER
#pragma message("warning: use \"ruby/io.h\" instead of \"rubyio.h\"")
#endif
#include "ruby/io.h"