Error building Fuerte on OSX

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I tried building Fuerte on OSX Lion but got the following boost error:

[ 16%] Generating Lisp code from actionlib_msgs/GoalID.msg
[ 16%] Generating Python from MSG geometry_msgs/QuaternionStamped
[ 16%] Generating C++ code from std_msgs/String.msg
[ 17%] Generating Lisp code from geometry_msgs/PointStamped.msg
[ 17%] Generating Lisp code from actionlib_msgs/GoalStatusArray.msg
[ 18%] Generating Python from MSG geometry_msgs/Point
[ 18%] Generating Lisp code from geometry_msgs/TransformStamped.msg
[ 18%] Generating Lisp code from actionlib_msgs/GoalStatus.msg
[ 18%] Generating Python from MSG geometry_msgs/Transform
[ 18%] Generating C++ code from std_msgs/UInt8MultiArray.msg
Linking CXX shared library ../../lib/librostime.dylib
Undefined symbols for architecture x86_64:
  "boost::system::system_category()", referenced from:
      __static_initialization_and_destruction_0(int, int)in time.cpp.o
      boost::thread_exception::thread_exception(int, char const*)in time.cpp.o
  "boost::system::generic_category()", referenced from:
      __static_initialization_and_destruction_0(int, int)in time.cpp.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[2]: *** [lib/librostime.dylib] Error 1
make[1]: *** [roscpp_core/rostime/CMakeFiles/rostime.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

I was using boost 1.50.0 via homebrew.