opencv pkg-config configuration problem in ubuntu with fuerte

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After ros-fuerte installation in ubuntu 12.04, I am having problems to compile my opencv programs.
I am getting the following results:

/usr/bin/ld: cannot find -lopencv_nonfree
/usr/bin/ld: cannot find -lopencv_photo
/usr/bin/ld: cannot find -lopencv_stitching
/usr/bin/ld: cannot find -lopencv_ts
/usr/bin/ld: cannot find -lopencv_videostab

I realised that ros-fuerte packages for ubuntu changes default pkg-config configuration file for opencv library, pointing to the files in the ros installation.

# pkg-config --cflags opencv
-I/opt/ros/fuerte/include/opencv -I/opt/ros/fuerte/include 

# pkg-config --libs opencv 
-L/opt/ros/fuerte/lib -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_gpu -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_nonfree -lopencv_objdetect -lopencv_photo -lopencv_stitching -lopencv_ts -lopencv_video -lopencv_videostab

• Why is ros changing the default opencv configuration for compilation?
• Can't just use a different pkg-config configuration file such as ros-opencv.pc?
• And, in case the default configuration must be changed, why it is not compatible with previous opencv configurations?

Update

I have found the problem. The setup.sh script of ros-fuerte updates the variable that uses pkg-config to find the configuration files

PKG_CONFIG_PATH=/opt/ros/fuerte/lib/pkgconfig:$PKG_CONFIG_PATH
export PKG_CONFIG_PATH

Now pkg-config gives preference to ROS configuration.

So the answer now is: Is this really needed to be in the setup.sh script?

Maybe rosmake can set this variable when using pkg-config to configure the compilation.