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-rw-r--r--ext/kgio/extconf.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/kgio/extconf.rb b/ext/kgio/extconf.rb
index 5fb15ac..44888dd 100644
--- a/ext/kgio/extconf.rb
+++ b/ext/kgio/extconf.rb
@@ -46,6 +46,8 @@ 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')