./tools/jam/src/bin.cygwinx86/bjam  --user-config=user-config.jam --prefix=/usr/local --exec-prefix=/usr/local --libdir=/usr/local/lib --includedir=/usr/local/include  install
Building Boost.Regex with the optional Unicode/ICU support disabled.
Please refer to the Boost.Regex documentation for more information
(don't panic: this is a strictly optional feature).
/boost/boost_1_34_0/tools/build/v2/build/virtual-target.jam:996: in virtual-target.register-actual-name from module virtual-target
error: Duplicate name of actual target: <p/usr/local/lib>exact.dll.a
error: previous virtual target { common%common.hard-link-exact.dll.a.IMPORT_LIB { common%common.copy-boost_signals-gcc41-mt-d-1_34.dll.a.IMPORT_LIB { gcc%gcc.link.dll-boost_signals-gcc41-mt-d-1_34.dll.a.IMPORT_LIB { gcc%gcc.compile.c++-trackable.o.OBJ { trackable.cpp.CPP } } { gcc%gcc.compile.c++-connection.o.OBJ { connection.cpp.CPP } } { gcc%gcc.compile.c++-named_slot_map.o.OBJ { named_slot_map.cpp.CPP } } { gcc%gcc.compile.c++-signal_base.o.OBJ { signal_base.cpp.CPP } } { gcc%gcc.compile.c++-slot.o.OBJ { slot.cpp.CPP } } } } }
error: created from ./install-unversioned
error: another virtual target { common%common.hard-link-exact.dll.a.IMPORT_LIB { common%common.copy-boost_prg_exec_monitor-gcc41-mt-d-1_34.dll.a.IMPORT_LIB { gcc%gcc.link.dll-boost_prg_exec_monitor-gcc41-mt-d-1_34.dll.a.IMPORT_LIB { gcc%gcc.compile.c++-execution_monitor.o.OBJ { execution_monitor.cpp.CPP } } { gcc%gcc.compile.c++-cpp_main.o.OBJ { cpp_main.cpp.CPP } } } } }
error: created from ./install-unversioned
error: added properties:  <define>BOOST_TEST_DYN_LINK=1
error: removed properties:  <define>BOOST_SIGNALS_DYN_LINK=1 <define>BOOST_SIGNALS_NO_LIB=1
/boost/boost_1_34_0/tools/build/v2/build/virtual-target.jam:459: in actualize-no-scanner from module object(file-target)@16510
/boost/boost_1_34_0/tools/build/v2/build/virtual-target.jam:111: in object(file-target)@16510.actualize from module object(file-target)@16510
/boost/boost_1_34_0/tools/build/v2/build-system.jam:476: in load from module build-system
/boost/boost_1_34_0/tools/build/v2/kernel/modules.jam:261: in import from module modules
/boost/boost_1_34_0/tools/build/v2/kernel/bootstrap.jam:132: in boost-build from module
/boost/boost_1_34_0/boost-build.jam:9: in module scope from module

Not all Boost libraries built properly.