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ROS and catkin packages need to know the installation path when they are built, so the catkin installation process requires that you specify the installation directory when you run catkin_make install. If you don't specify an installation directory, it defaults to the install directory within your workspace.
You can change the destination directory with -DCMAKE_INSTALL_PREFIX:
$ catkin_make -DCMAKE_INSTALL_PREFIX=/opt/ros/<distro> install
You may want to choose an installation directory like /opt/PapaG that doesn't overlap with the system ROS installation, and then instruct you users to install the files in that directory.
The catkin_make wiki page provides more details and examples of how you can use catkin_make and its install command.
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