extconf.rb in kgio-2.9.0

- old
+ new

@@ -44,9 +44,11 @@
 check_sizeof("int")
 have_func('rb_io_ascii8bit_binmode')
 have_func('rb_update_max_fd')
 have_func('rb_fd_fix_cloexec')
 have_func('rb_cloexec_open')
+have_header('ruby/thread.h')
+have_func('rb_thread_call_without_gvl', %w{ruby/thread.h})
 have_func('rb_thread_blocking_region')
 have_func('rb_thread_io_blocking_region')
 have_func('rb_str_set_len')
 have_func('rb_time_interval')
 have_func('rb_wait_for_single_fd')