Build specific package using catkin_make

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Hi there,
I'm running ROS Indigo on Raspberry Pi 2 model B. I need to build some packages of my own. Whenever I do catkin_make, all the packages in the src is getting complied. I want to make only one package. I tried catkin_make --pkg package and catkin_make -DCATKIN_WHITELIST_PACKAGES="package". Still every packages are getting build. Is there any other method to do this? Also why there are some extra folders in the workspace - build_isolated, devel_isolated and external_src. Why do we need them?

Thanks in advance.