Maintaining backwards compatibility (opencv2 problem)

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Hi.

I have a bunch of packages that were developed on ROS CTurtle but now I'm trying to upgrade them to compile on Fuerte.

Most of it just works, but I am having problems with one of my packages that link against OpenCV.

Very briefly, I found out that in Fuerte I need to put the following in my CMakeLists.txt:

find_package(OpenCV REQUIRED)

rosbuild_add_executable(foo src/foo.cpp)
target_link_libraries(foo ${OpenCV_LIBRARIES})

This works fine for Fuerte, but unfortunately, when I try to build now on CTurtle I get an error stating that the FindOpenCV.cmake file could not be found.

To fix that, I added the following above the find_package line:

set(OpenCV_DIR /opt/ros/cturtle/stacks/vision_opencv/opencv2/opencv/share/opencv/)

Now, my stuff compiles on CTurtle, but since the cturtle path is now hard-coded into the CMakeLists.txt file, it fails on Fuerte!

So my question (finally) is, is there a way to maintain "backwards compatibility" so I can build my packages on top of both CTurtle and Fuerte? Am I maybe doing something wrong (having to specify the OpenCV_DIR variable doesn't look like it should have to be done)? Is there a way to selectively define the variable only if I'm doing it on CTurtle?

Kind regards, Stefan Freyr