Hello, Has anyone else had this problem? I am trying to build a program that uses the boost_thread library (v. 1.30.0), but get this error repeatedly: /usr/local/include/boost/type_traits/is_convertible.hpp: At top level: /usr/local/include/boost/type_traits/is_convertible.hpp:184: template instantiation depth exceeds maximum of 17 (use -ftemplate-depth-NN to increase the maximum) instantiating `struct boost::add_reference' /usr/local/include/boost/type_traits/is_convertible.hpp:184: instantiated from `boost::detail::is_convertible_impl' /usr/local/include/boost/type_traits/is_enum.hpp:91: instantiated from `boost::is_convertible' /usr/local/include/boost/type_traits/is_enum.hpp:91: instantiated from `boost::detail::is_enum_helper<false>::type' /usr/local/include/boost/type_traits/is_enum.hpp:91: instantiated from `boost::detail::is_enum_implVOS::AsyncConnect' /usr/local/include/boost/type_traits/is_scalar.hpp:30: instantiated from `boost::is_enumVOS::AsyncConnect' /usr/local/include/boost/type_traits/is_scalar.hpp:30: instantiated from `boost::detail::is_scalar_implVOS::AsyncConnect' /usr/local/include/boost/type_traits/is_pod.hpp:35: instantiated from `boost::is_scalarVOS::AsyncConnect' /usr/local/include/boost/type_traits/is_pod.hpp:35: instantiated from `boost::detail::is_pod_implVOS::AsyncConnect' /usr/local/include/boost/type_traits/has_trivial_constructor.hpp:28: instantiated from `boost::is_PODVOS::AsyncConnect' /usr/local/include/boost/type_traits/has_trivial_constructor.hpp:28: instantiated from `boost::is_podVOS::AsyncConnect' /usr/local/include/boost/type_traits/has_trivial_constructor.hpp:28: instantiated from `boost::detail::has_trivial_ctor_implVOS::AsyncConnect' /usr/local/include/boost/type_traits/is_stateless.hpp:31: instantiated from `boost::has_trivial_constructorVOS::AsyncConnect' /usr/local/include/boost/type_traits/is_stateless.hpp:31: instantiated from `boost::detail::is_stateless_implVOS::AsyncConnect' /usr/local/include/boost/function/function_base.hpp:195: instantiated from `boost::is_statelessVOS::AsyncConnect' /usr/local/include/boost/function/function_base.hpp:195: instantiated from `boost::detail::function::get_function_tagVOS::AsyncConnect' /usr/local/include/boost/function/function_template.hpp:431: instantiated from `boost::function0::assign_to (Functor) [with Functor = VOS::AsyncConnect, R = void, Allocator = allocatorboost::function_base]' /usr/local/include/boost/function/function_template.hpp:293: instantiated from `boost::function0::function0 (Functor) [with Functor = VOS::AsyncConnect, R = void, Allocator = allocatorboost::function_base]' remotesocketsite.cc:565: instantiated from here /usr/local/include/boost/type_traits/is_convertible.hpp:184: invalid use of undefined type `struct boost::add_reference' /usr/local/include/boost/type_traits/add_reference.hpp:78: forward declaration of `struct boost::add_reference' VOS::AsyncConnect is my program's class. Setting -ftempate-depth-20 resolves the problem. This problem does not appear in Boost 1.29.0 Any information is greatly appreciated. Thanks reed PS. Here is the full source files: http://www-robotics.cs.umass.edu/~reed/remotesocketsite.hh http://www-robotics.cs.umass.edu/~reed/remotesocketsite.cc The entire project can be downloaded from anonymous CVS (see http://interreality.org)