use custom ompl instead of ros own ompl

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Hey there I would like to develop some path planning algorithms along with ompl, however, it is not easy to use the ros build-in ompl. I would like to build the ompl from source in case of easy revision. I have another package that use ompl (which is : ompl_move_base) , how should I write in CMakeList.txt file so as to use the ompl in /usr/local instead of the one in /ros/indigo/ ?

Many many thanks!