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-rw-r--r--ext/tk/tkutil/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/tkutil/extconf.rb b/ext/tk/tkutil/extconf.rb
index dd00d5d535..51f775619c 100644
--- a/ext/tk/tkutil/extconf.rb
+++ b/ext/tk/tkutil/extconf.rb
@@ -7,5 +7,6 @@ end
if has_tk
require 'mkmf'
+ have_func("rb_obj_instance_exec", "ruby.h")
create_makefile('tkutil')
end