When I attempt to create a boost-1.39.0 RPM, I encounter the following error: + bjam -j2 -d2 --layout=tagged --toolset=gcc variant=release threading=single,multi optimization=speed 'linkflags= -Wl,--as-needed -Wl,--no-undefined -lpython2.5' debug-symbols=on -sHAVE_ICU=1 --prefix=/usr --libdir=/usr/lib nBuilding C++ Boost. After the build, the headers will be located at /home/scott/RPM/BUILD/boost_1_39_0 The libraries will be located at /home/scott/RPM/BUILD/boost_1_39_0/stage/lib Use 'bjam install --prefix=<path>' if you wish to install headers and libraries to a different location and remove the source tree.nn warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. Note: Building Boost.Regex with Unicode/ICU support enabled Using ICU in /home/scott/RPM/BUILD/boost_1_39_0/tools/build/v2/build/virtual-target.jam:1056: in virtual-target.register-actual-name from module virtual-target error: Duplicate name of actual target: <pstage/lib>libboost_date_time.so.1.39.0 error: previous virtual target { common%common.copy-libboost_date_time.so.1.39.0.SHARED_LIB { gcc%gcc.link.dll-libboost_date_time.so.1.39.0.SHARED_LIB { gcc%gcc.compile.c++-gregorian/greg_month.o.OBJ { gregorian/greg_month.cpp.CPP } } { gcc%gcc.compile.c++-gregorian/greg_weekday.o.OBJ {gregorian/greg_weekday.cpp.CPP } } { gcc%gcc.compile.c++-gregorian/date_generators.o.OBJ { gregorian/date_generators.cpp.CPP } } } } I have changed the original --layout= option in the specfile from --layout=system to --layout=tagged per Vladimir's suggestion here http://lists.boost.org/Archives/boost/2009/05/151541.php. Anyone have a suggestion? -- Scott