Hi ! According to http://www.boost.org/development/tests/trunk/developer/test.html nearly all compilers fail compiling test_fp_comparisons.cpp. With gcc-4.4 I get: test_fp_comparisons.cpp: In member function ‘void test_close_at_tolerance::test_method()’: test_fp_comparisons.cpp:165: error: reference to ‘fpc’ is ambiguous test_fp_comparisons.cpp:157: error: candidates are: namespace fpc = boost::math::boost::math::fpc; /home/hunold/src/devel/boost/boost/test/floating_point_comparison.hpp:280: error: namespace boost::test_tools::fpc = boost::math::boost::math::fpc; The attached patch removes the offending namespace alias in the test file. Okay to commit ? Yours, Jürgen -- * Dipl.-Math. Jürgen Hunold ! Ingenieurgesellschaft für * voice: ++49 511 262926 57 ! Verkehrs- und Eisenbahnwesen mbH * fax : ++49 511 262926 99 ! Lister Straße 15 * juergen.hunold@ivembh.de ! www.ivembh.de * * Geschäftsführer: ! Sitz des Unternehmens: Hannover * Prof. Dr.-Ing. Thomas Siefer ! Amtsgericht Hannover, HRB 56965 * PD Dr.-Ing. Alfons Radtke !