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-rw-r--r--ext/tdb/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tdb/extconf.rb b/ext/tdb/extconf.rb
index f7bb223..b309b2a 100644
--- a/ext/tdb/extconf.rb
+++ b/ext/tdb/extconf.rb
@@ -2,6 +2,7 @@ require 'mkmf'
 
 have_func('rb_thread_blocking_region')
 have_func('rb_thread_call_with_gvl')
+have_func('rb_thread_call_without_gvl', 'ruby/thread.h')
 
 dir_config('tdb')
 have_header('tdb.h') or abort 'tdb.h missing'