CW 9.4 fails to compile floating_point_comparison.hpp (see http://tinyurl.com/ybzaze ) because of line 36: enum BOOST_TEST_DECL floating_point_comparison_type { where BOOST_TEST_DECL resolves to __declspec(dllimport) or __declspec(dllexport) depending on the context. Seemingly, this compiler does not support __declspec applied to enum types --usage with classes and functions is supported, though. The obvious workaround is to replace the offending line with #if BOOST_WORKAROUND(__MWERKS__,BOOST_TESTED_AT(0x3205)) enum floating_point_comparison_type { #else enum BOOST_TEST_DECL floating_point_comparison_type { #endif Is it OK for me to commit this change to the HEAD and RC_1_34_0? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo