Hi, In our debug builds, we build ICU in debug mode and it creates libraries with a "d" suffix (e.g. icuucd.lib). When I build boost regex now with: bjam.exe -sICU_PATH=<somepath>\icu -d+2 --debug-configuration toolset=msvc-9.0 threading=multi python-debugging=on link=shared variant=debug --without-mpi libs\regex\build it doesn't find the ICU libs and the linker complains. I then tried to give ICU_LINK (e.g. like this): bjam.exe -sICU_PATH=<somepath>\icu -sICU_LINK=icuucd.lib toolset=msvc-9.0 threading=multi python-debugging=on link=shared variant=debug --without-mpi libs\regex\build but it doesn't add the icuucd.lib to the linker file "bin.v2\libs\regex\build\msvc-9.0\debug\python-debugging-on\threading-multi\boost_regex-vc90-mt-gyd-1_38.dll.rsp" and I get unresolved symbols. Any idea how to do this without hacking the Jamfile.v2? Thanks a lot, Chris