Continuing with building at the root for trunk... The math library fails to build for my on MacOSX with Xcode (3.1-beta7) with this error: darwin.compile.c++ bin.v2/libs/math/build/has_long_double_support.test/darwin-4.0.1/release/architecture-combined/macosx-version-min-10.3/macosx-version-10.5/threading-multi/has_long_double_support.o libs/math/build/has_long_double_support.cpp:5:2: error: #error "long double support not enabled" lipo: can't figure out the architecture type of: /var/tmp//ccouTTrW.out "/Developer/Xcode-3.1-beta7/usr/bin/g++-4.0" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -fPIC -mmacosx-version-min=10.3 -dynamic -no-cpp-precomp -gdwarf-2 -Wno-long-double -isysroot /Developer/Xcode-3.1-beta7/SDKs/MacOSX10.5.sdk -arch i386 -arch ppc -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/math/build/has_long_double_support.test/darwin-4.0.1/release/architecture-combined/macosx-version-min-10.3/macosx-version-10.5/threading-multi/has_long_double_support.o" "libs/math/build/has_long_double_support.cpp" The problem is that the Jamfile for the math lib is doing a compile test. That seems like a bad idea to me if there's no purpose other than to just do the test. So, is there a good reason for doing that test during build? PS. It makes it a PITA to test building Boost before merging to release with such things going on! -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org (msn) - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim,yahoo,skype,efnet,gmail