When I compile this script (saved as test.cpp) which includes a pair of Boost Graph headers : #include <boost/graph/adjacency_list.hpp> #include <boost/graph/depth_first_search.hpp> int main() { return 0; } ...using the compile command : g++ -I/usr/include/boost -D_GLIBCXX_DEBUG test.cpp -o test ...I get (this warning and) these errors from the Boost Spirit library: In file included from /usr/include/c++/4.3/backward/hash_set:64, from /usr/include/boost/graph/adjacency_list.hpp:25, from test.cpp:1: /usr/include/c++/4.3/backward/backward_warning.h:33:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated. In file included from /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/has_find.hpp:23, from /usr/include/boost/spirit/home/phoenix/stl/algorithm/querying.hpp:17, from /usr/include/boost/spirit/home/phoenix/algorithm.hpp:11, from /usr/include/boost/spirit/home/phoenix.hpp:10, from /usr/include/boost/graph/depth_first_search.hpp:24, from test.cpp:2: /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_map.hpp:38: error: wrong number of template arguments (4, should be 1) /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_map.hpp:28: error: provided for ‘template<class T> struct boost::is_std_map’ /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_map.hpp:38: error: expected unqualified-id before ‘>’ token /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_map.hpp:53: error: wrong number of template arguments (4, should be 1) /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_map.hpp:43: error: provided for ‘template<class T> struct boost::is_std_multimap’ /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_map.hpp:53: error: expected unqualified-id before ‘>’ token In file included from /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/has_find.hpp:24, from /usr/include/boost/spirit/home/phoenix/stl/algorithm/querying.hpp:17, from /usr/include/boost/spirit/home/phoenix/algorithm.hpp:11, from /usr/include/boost/spirit/home/phoenix.hpp:10, from /usr/include/boost/graph/depth_first_search.hpp:24, from test.cpp:2: /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_set.hpp:37: error: wrong number of template arguments (3, should be 1) /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_set.hpp:28: error: provided for ‘template<class T> struct boost::is_std_set’ /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_set.hpp:37: error: expected unqualified-id before ‘>’ token /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_set.hpp:51: error: wrong number of template arguments (3, should be 1) /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_set.hpp:42: error: provided for ‘template<class T> struct boost::is_std_multiset’ /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_set.hpp:51: error: expected unqualified-id before ‘>’ token In file included from /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/has_sort.hpp:22, from /usr/include/boost/spirit/home/phoenix/stl/algorithm/transformation.hpp:17, from /usr/include/boost/spirit/home/phoenix/algorithm.hpp:12, from /usr/include/boost/spirit/home/phoenix.hpp:10, from /usr/include/boost/graph/depth_first_search.hpp:24, from test.cpp:2: /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_list.hpp:36: error: wrong number of template arguments (2, should be 1) /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_list.hpp:28: error: provided for ‘template<class T> struct boost::is_std_list’ /usr/include/boost/spirit/home/phoenix/stl/algorithm/detail/./is_std_list.hpp:36: error: expected unqualified-id before ‘>’ token I don't get the errors if I use this compile command which doesn't define _GLIBCXX_DEBUG : g++ -I/usr/include/boost test.cpp -o test ...and I don't get the errors if I use this compile command which uses the previous 1.39 libraries : g++ -I/usr/include/boost-1_39 -D_GLIBCXX_DEBUG test.cpp -o test If I reverse the order of the headers when using the original compile command, I still get errors but different errors. My compiler is gcc 4.3.3 (Ubuntu 4.3.3-5ubuntu4), my OS is Ubuntu 9.04 and my kernel is 2.6.28-15-generic. Many thanks in advance for any help. _________________________________________________________________ View your other email accounts from your Hotmail inbox. Add them now. http://clk.atdmt.com/UKM/go/167688463/direct/01/