sbpl_lattice_planner not recognizing location of sbpl

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I am trying to install sbpl_lattice_planner. I have previously installed the motion_planners stack and had a successful rosmake for the sbpl package. When I do a rosmake for sbpl_lattice_planner I get an error that it cannot find sbpl.

[rosmake-1] Starting >>> sbpl_lattice_planner [ make ]                          
[ rosmake ] All 18 linesbpl_lattice_planner: 2.2 ... [ 1 Active 35/36 Complete ]
{-------------------------------------------------------------------------------
  mkdir -p bin
  cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=`rospack find rosbuild`/rostoolchain.cmake  ..
  [rosbuild] Building package sbpl_lattice_planner
  [rosbuild] Cached build flags older than manifests; calling rospack to get flags
  [rosbuild] Including /opt/ros/fuerte/share/roscpp/rosbuild/roscpp.cmake
  [rosbuild] Including /opt/ros/fuerte/share/rospy/rosbuild/rospy.cmake
  [rosbuild] Including /opt/ros/fuerte/share/roslisp/rosbuild/roslisp.cmake
  -- checking for module 'sbpl'
  --   package 'sbpl' not found
  CMake Error at /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:266 (message):
    A required package was not found
  Call Stack (most recent call first):
    /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:320 (_pkg_check_modules_internal)
    CMakeLists.txt:15 (pkg_check_modules)


  -- Configuring incomplete, errors occurred!
-------------------------------------------------------------------------------}
[ rosmake ] Output from build of package sbpl_lattice_planner written to:
[ rosmake ]    /home/matt/.ros/rosmake/rosmake_output-20121017-100717/sbpl_lattice_planner/build_output.log
[rosmake-1] Finished <<< sbpl_lattice_planner [FAIL] [ 2.24 seconds ]           
[ rosmake ] Halting due to failure in package sbpl_lattice_planner. 
[ rosmake ] Waiting for other threads to complete.
[ rosmake ] Results:                                                            
[ rosmake ] Built 36 packages with 1 failures.                                  
[ rosmake ] Summary output to directory                                         
[ rosmake ] /home/matt/.ros/rosmake/rosmake_output-20121017-100717 

I have read comments and answers on this question and this question but the solution to the first was to install sbpl (done) and the second isn't exactly the same thing as my problem. I did try adding sbpl to the manifest.xml for sbpl_lattice_planner, but that didn't help either.

What am I missing? Is there something that I need to do in order to get pkg_check_modules to work correctly?

I'm running fuerte on Ubuntu 12.04 with the packages installed in a ros_workspace directory instead of in opt/ros/fuerte. I'm using rosws to set and update the packages and remembering to source the setup.bash before doing the rosmake.

Also, would someone please upvote this so I can get the Karma to comment? I would have added this as a comment to the first question linked above, but I don't have the points yet.