Find Eigen on OS X

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I'm currently using this method:

project(grizzly_msgs)
find_package(catkin REQUIRED)
find_package(Eigen REQUIRED)

catkin_package(
  INCLUDE_DIRS include ${Eigen_INCLUDE_DIRS} 
  DEPENDS eigen
)

This works great in Ubuntu and on the buildfarm, but gave me a problem when I attempted to compile under OS X / Indigo / homebrew—unable to find the EigenConfig.cmake module. I have Eigen 3.2 installed via homebrew, but it doesn't seem to supply a cmake module. Is there some better way to do this which will work for Ubuntu and other OSes?

Update: Looks like the FindEigen.cmake module is right there in the usual place:

/opt/ros/indigo/share/cmake_modules/cmake/Modules/FindEigen.cmake

Do I need to build_depend on cmake_modules in order for cmake to find these?