Ros install problem OSX 10.6.8

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When trying to install rosjava using this link: http://www.ros.org/wiki/fuerte/Installation/OSX/Homebrew/Source

I get to the step where I run the command:

make -j8

This command fails with the following output:

[ 11%] [ 11%] Built target std_msgs_genpy
[ 11%] Built target std_msgs_gencpp
[ 11%] Built target cpp_common
[ 11%] Built target roscpp_serialization
Built target std_msgs_genlisp
Linking CXX shared library ../../lib/librostime.dylib
[ 11%] [ 11%] Built target xmlrpcpp
Built target rospack
[ 11%] Built target roscpp_gencpp
[ 11%] Undefined symbols:
  "boost::system::generic_category()", referenced from:
      __static_initialization_and_destruction_0(int, int)in time.cpp.o
      __static_initialization_and_destruction_0(int, int)in time.cpp.o
  "boost::system::system_category()", referenced from:
      boost::thread_exception::thread_exception(int, char const*)in time.cpp.o
      __static_initialization_and_destruction_0(int, int)in time.cpp.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [lib/librostime.dylib] Error 1
Built target topic_tools_genpy
[ 11%] [ 11%] Built target topic_tools_genlisp
[ 11%] Built target topic_tools_gencpp
[ 11%] make[1]: *** [roscpp_core/rostime/CMakeFiles/rostime.dir/all] Error 2
Built target test_rosservice_gencpp
make[1]: *** Waiting for unfinished jobs....
Built target roscpp_genpy
[ 11%] Built target roscpp_genlisp
make: *** [all] Error 2

Can anyone advise how I can fix this error? I am using osx 10.6.8 and the boost version thats installed is 1.49.0.