I've been mentioning this problem on the "Boost.Test problem" / "Boost.Threads problem" / "Boost.Threads status?" thread, but have been getting no help, so I thought I'd try a new thread. All of the Boost.Threads regression tests are failing due to an error like this: <quote> Cannot open include file: 'boost/thread/detail/config.hpp': No such file or directory </quote> The "missing" file is in cvs, and has been for a long time. Looking at the compiler command line, I see that the it contains -I"C:\Users\Administrator\boost\main\results\bin\boost\libs\thread\build" and no other directory; looking at the command line for other Boost libraries, I see that they also contain -I"C:\Users\Administrator\boost\main\boost". What do I need to do to get Boost.Threads to build with -I"C:\Users\Administrator\boost\main\boost"? Is it a problem with the Boost.Threads bjam file? A configuration problem with the regression tests? Something else? Mike