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/usr/include/ruby-2.1.0/ruby/subst.h is in ruby2.1-dev 2.1.5-2+deb8u3.

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#ifndef RUBY_SUBST_H
#define RUBY_SUBST_H 1

#undef snprintf
#undef vsnprintf
#define snprintf ruby_snprintf
#define vsnprintf ruby_vsnprintf

#ifdef BROKEN_CLOSE
#undef getpeername
#define getpeername ruby_getpeername
#undef getsockname
#define getsockname ruby_getsockname
#undef shutdown
#define shutdown ruby_shutdown
#undef close
#define close ruby_close
#endif
#endif