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There is a hint that the ROS Installation on OSX can hang for log4cxx and a fresh install of the Apple Java thingy: http://mirror.umd.edu/roswiki/electric(2f)Installation(2f)OSX(2f)Homebrew.html 3.2 Log4cxx Installation Hangs
After that I installed log4cxx manually with brew:
brew install -v log4cxx
When restarting the ROS installation, I had also some error on ros_comm-rosconsole and applied the patch provided in: https://code.ros.org/trac/ros/attachment/ticket/3626/ros_comm-rosconsole-llvm.patch
After that the installation worked on a "clean" Lion install with the new XCode 4.3 compiler tools.
Perhaps that helps....