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/usr/include/ruby-2.0.0/ruby/backward/util.h is in ruby2.0-dev 2.0.0.484-1ubuntu2.

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#if   defined __GNUC__
#warning use "ruby/util.h" instead of bare "util.h"
#elif defined _MSC_VER || defined __BORLANDC__
#pragma message("warning: use \"ruby/util.h\" instead of bare \"util.h\"")
#endif
#include "ruby/util.h"