/usr/include/boost/lambda/ is in libboost1.49-dev 1.49.0-3.2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/lambda/algorithm.hpp
/usr/include/boost/lambda/bind.hpp
/usr/include/boost/lambda/casts.hpp
/usr/include/boost/lambda/closures.hpp
/usr/include/boost/lambda/construct.hpp
/usr/include/boost/lambda/control_structures.hpp
/usr/include/boost/lambda/core.hpp
/usr/include/boost/lambda/detail/
/usr/include/boost/lambda/detail/actions.hpp
/usr/include/boost/lambda/detail/arity_code.hpp
/usr/include/boost/lambda/detail/bind_functions.hpp
/usr/include/boost/lambda/detail/control_constructs_common.hpp
/usr/include/boost/lambda/detail/function_adaptors.hpp
/usr/include/boost/lambda/detail/is_instance_of.hpp
/usr/include/boost/lambda/detail/lambda_config.hpp
/usr/include/boost/lambda/detail/lambda_functor_base.hpp
/usr/include/boost/lambda/detail/lambda_functors.hpp
/usr/include/boost/lambda/detail/lambda_fwd.hpp
/usr/include/boost/lambda/detail/lambda_traits.hpp
/usr/include/boost/lambda/detail/member_ptr.hpp
/usr/include/boost/lambda/detail/operator_actions.hpp
/usr/include/boost/lambda/detail/operator_lambda_func_base.hpp
/usr/include/boost/lambda/detail/operator_return_type_traits.hpp
/usr/include/boost/lambda/detail/operators.hpp
/usr/include/boost/lambda/detail/ret.hpp
/usr/include/boost/lambda/detail/return_type_traits.hpp
/usr/include/boost/lambda/detail/select_functions.hpp
/usr/include/boost/lambda/detail/suppress_unused.hpp
/usr/include/boost/lambda/exceptions.hpp
/usr/include/boost/lambda/if.hpp
/usr/include/boost/lambda/lambda.hpp
/usr/include/boost/lambda/loops.hpp
/usr/include/boost/lambda/numeric.hpp
/usr/include/boost/lambda/switch.hpp