1 files changed, 1 insertions, 0 deletions
diff --git a/extconf.rb b/extconf.rb
index c4b5c81..7d1dc5d 100644
--- a/extconf.rb
+++ b/extconf.rb
@@ -98,6 +98,7 @@ end
 
 message "=== Checking for Ruby features... ===\n"
 have_func("rb_obj_init_copy", "ruby.h")
+have_func("rb_block_proc", "ruby.h")
 
 message "=== Checking done. ===\n"
 if ruby_version >= 1.8