While examining some error in regression tests I have noticeed that this error does not appear when I'm starting bjam in "test" directory of library. It does however appear in regression test. Reason for this discrepancy is that regression tests are always started from boost/status/Jamfile , and this Jamfile contains number of settings for specific tests ; thus when test started from different Jamfile (like the one in test directory) these settings are not applied, effectively both Jamfiles produce different results. I hope it's possible to move all these library-specific settings into specific Jamfiles in test directories? Right now it might be quite difficult to fix regression errors for someone not willing to run full regression tests. B.