Hello, I am currently trying to build Boost on MacOSX 10.1.2. I 'made' Jam for MacOSX then typed jam -sBOOST_ROOT=. -sTOOLS="gcc" to build Boost. As a result, I got many failures: ..... g++ -c -Wall -ftemplate-depth-100 -DNDEBUG -DBOOST_RE_BUILD_DLL=1 -O4 -finline-functions -Wno-inline -fPIC -I"libs/regex/build" -I"." -o "libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/w32_regex_traits.o" "libs/regex/build/../src/w32_regex_traits.cpp" ...failed gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/w32_regex_traits.o ... gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/wide_posix_api.o zsh: command not found: g++ g++ -c -Wall -ftemplate-depth-100 -DNDEBUG -DBOOST_RE_BUILD_DLL=1 -O4 -finline-functions -Wno-inline -fPIC -I"libs/regex/build" -I"." -o "libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/wide_posix_api.o" "libs/regex/build/../src/wide_posix_api.cpp" ...failed gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/wide_posix_api.o ... ...skipped libboost_regex.so for lack of c_regex_traits.o... ...failed updating 78 targets... ...skipped 8 targets... Has anyone in this group managed to build Boost on MacOS 10.1.2? If so, what configuration did you use? Could you please send me your ProjectBuilder project file? Many thanks. Philippe de Rochambeau