I suspect the answer to this is going to be really simple, but I've been trying to figure it out for several hours and I'm ready to give up (I couldn't even find a mention of the problem in the mailing list archives). All I want to do is use the Boost Unit Test library with gcc under Linux. I have Boost 1.32 correctly installed (I've used other libraries successfully without any problems). Now I simply try to compile the simplest possible example: http://www.boost.org/libs/test/example/unit_test_example1.cpp This is what I get: gcc -o test boost_test.cpp boost_test.cpp:11: error: `boost::unit_test' has not been declared boost_test.cpp:11: error: expected nested-name-specifier before "test_suite" boost_test.cpp:11: error: `test_suite' has not been declared boost_test.cpp:23: error: expected constructor, destructor, or type conversion before '*' token boost_test.cpp:23: error: expected `,' or `;' before '*' token boost::unit_test has not been declared??? How is that possible? The compiler is correctly including the boost/test/unit_test.hpp file from the first line of the program. What am I missing? It must be something really, really stupid. I can tell :-) Happy holidays everyone! --Noel Games from Within http://www.gamesfromwithin.com