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/usr/include/ruby-1.9.1/ruby/backward/st.h is in ruby1.9.1-dev 1.9.3.484-2ubuntu1.

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