/usr/lib/ruby/vendor_ruby/gir_ffi/builders/ is in ruby-gir-ffi 0.9.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/argument_builder_collection.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/base_argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/base_method_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/base_type_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/boxed_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/c_to_ruby_convertor.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/callback_argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/callback_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/callback_return_value_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/closure_argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/closure_convertor.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/closure_return_value_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/closure_to_pointer_convertor.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/constant_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/constructor_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/enum_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/error_argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/field_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/flags_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/full_c_to_ruby_convertor.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/function_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/initializer_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/initializer_return_value_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/interface_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/mapping_method_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/marshalling_method_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/method_template.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/module_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/null_argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/null_class_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/null_convertor.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/null_return_value_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/object_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/property_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/registered_type_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/return_value_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/ruby_to_c_convertor.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/signal_closure_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/struct_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/type_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/unintrospectable_boxed_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/unintrospectable_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/union_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/user_defined_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/vfunc_argument_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/vfunc_builder.rb
/usr/lib/ruby/vendor_ruby/gir_ffi/builders/with_layout.rb