extconf.rb in sleepy_penguin-1.3.0

- old
+ new

@@ -2,9 +2,10 @@
 have_header('sys/epoll.h') or abort 'sys/epoll.h not found'
 have_header("pthread.h") or abort 'pthread.h not found'
 have_header('sys/eventfd.h')
 have_header('sys/signalfd.h')
 have_header('sys/timerfd.h')
+have_header('ruby/io.h') and have_struct_member('rb_io_t', 'fd', 'ruby/io.h')
 have_func('rb_memerror')
 have_func('rb_io_close')
 have_func('epoll_create1', %w(sys/epoll.h))
 have_func('rb_thread_blocking_region')
 have_library('pthread')