1 files changed, 2 insertions, 0 deletions
diff --git a/extconf.rb b/extconf.rb
index 026b6c3..0709016 100644
--- a/extconf.rb
+++ b/extconf.rb
@@ -2,6 +2,8 @@ require 'mkmf'
  
  dir_config('magic')
  have_library('magic', 'magic_open')
+have_func('rb_thread_call_without_gvl')
+have_func('rb_thread_blocking_region')
  create_makefile('mahoro')
  
  # arch-tag: extconf