Hi, For quite a long time updating to boost trunk makes Boost.Serialization not able to build. I've seen the conversation between Peter and Robert about this failure but it seems there was no final resolution reached. Right now I solve the problem by removing dependencies on Boost.Config from Boost.Serialization Jamfile every time I update to trunk. Is there something I should do on my local machine to make the library build without doing so or the issue should be solved in the repository (either by fixing the Jamfile or some another way)? I've attached the bjam output. The configuration is gcc 4.2.1 on SUSE Linux, if that matters. 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. lib.jam: No such file or directory libs/config/test/Jamfile.v2:41: in modules.load rule compile-fail unknown in module Jamfile</home/lastique/src/boost/trunk/libs/config/test>. /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:307: in load-jamfile /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:63: in load /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:116: in load-parent /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:443: in initialize /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:297: in load-jamfile /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:63: in load /home/lastique/src/boost/trunk/tools/build/v2/build/project.jam:167: in project.find /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:354: in find-really /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:408: in object(project-target)@221.find /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:827: in resolve-reference /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:843: in targets.generate-from-reference /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:1129: in generate-dependencies /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:1176: in object(typed-target)@226.generate /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:742: in generate-really /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:715: in object(main-target)@898.generate /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:254: in object(project-target)@221.generate /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:858: in targets.generate-from-reference /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:1129: in generate-dependencies /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:1179: in object(install-target-class)@94.generate /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:742: in generate-really /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:715: in object(main-target)@331.generate /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:858: in targets.generate-from-reference /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:1129: in generate-dependencies /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:1179: in object(alias-target-class)@100.generate /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:742: in generate-really /home/lastique/src/boost/trunk/tools/build/v2/build/targets.jam:715: in object(main-target)@335.generate /home/lastique/src/boost/trunk/tools/build/v2/build-system.jam:663: in load /home/lastique/src/boost/trunk/tools/build/v2/kernel/modules.jam:267: in import /home/lastique/src/boost/trunk/tools/build/v2/kernel/bootstrap.jam:134: in boost-build /home/lastique/src/boost/trunk/boost-build.jam:11: in module scope