Hi all! Please enlighten me what is the difference between libboost_foo.dylib and libboost_foo-mt.dylib? I guess -mt naming convention originates from Windows which once had both signle- and multithreaded CRT (-mt). However there is neither a single-threaded CRT nor a single-threaded program on Mac, thanks to GCD. Is there any use for non-MT libboost_foo.dylib or not? And let me squeeze another vaguely related question in the same letter. Are Boost debug and normal library variants binary-compatible? The reason I am curious is because Mac dynamic library linker (dyld) has a promising feature to load a different library variant without program recompilation. This feature is activated through the environment variable DYLD_IMAGE_SUFFIX. Ex: setting DYLD_IMAGE_SUFFIX=_debug will result in dyld attempting to load libfoo_debug.dylib instead of libfoo.dylib. Thanks in advance.