Hi, FWIW, I tried the following command and it seems to work (the build is going on as I am typing this mail). Following are some of the output. Note that I am building in a different drive with a space in the folder and staging it in a different drive with a folder with a space. I see no problems, I am on XP. E:\cache\build\Test Me\boost_1_34_1 [dky]bjam --toolset=gcc --build-dir="C:/Program Files/boost/directory_1" --stage Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). ...patience... ...patience... ...found 5406 targets... ...updating 2195 targets... MkDir1 C:\Program Files\boost MkDir1 C:\Program Files\boost\directory_1 MkDir1 C:\Program Files\boost\directory_1\boost MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2 MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2\libs MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1 MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug MkDir1 C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug\threading-multi gcc.compile.c++ C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug\threading-multi\trackable.o gcc.compile.c++ C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug\threading-multi\connection.o gcc.compile.c++ C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug\threading-multi\named_slot_map.o gcc.compile.c++ C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug\threading-multi\signal_base.o gcc.compile.c++ C:\Program Files\boost\directory_1\boost\bin.v2\libs\signals\build\gcc-mingw-4.2.1\debug\threading-multi\slot.o -dky -- Dhruva Krishnamurthy Contents reflect my personal views only!