Hi I svn the boost file from the trunk version. I get the following errors. error: default build must be identical in all alternatives error: main target is ./prg_exec_monitor error: with <link>shared <link>static <runtime-link>shared <runtime-link>static <threading>multi <threading>single <variant>debug <variant>release error: differing from previous default build <link>shared <runtime-link>shared < threading>multi <variant>release C:/boost_1_34_1/tools/build/v2/build\targets.jam:450: in build-main-targets from module object(project-target)@35 C:/boost_1_34_1/tools/build/v2/build\targets.jam:317: in main-target from module object(project-target)@35 C:/boost_1_34_1/tools/build/v2/build\targets.jam:375: in find-really from module object(project-target)@35 C:/boost_1_34_1/tools/build/v2/build\targets.jam:408: in object(project-target)@ 35.find from module object(project-target)@35 C:/boost_1_34_1/tools/build/v2\build-system.jam:620: in load from module build-s ystem C:\boost_1_34_1\tools\build\v2/kernel\modules.jam:267: in import from module mod ules C:\boost_1_34_1\tools\build\v2/kernel/bootstrap.jam:132: in boost-build from mod ule C:\boost_1_34_1\boost-build.jam:11: in module scope from module the orginal 1.34.1 works for me.. this doesn't/