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How much adaptation is needed depends on how many of the ROS APIs that package uses that have changed since Hydro.

If the package is still using rosbuild, you will need to change it to use catkin instead. This will include changing the manifest.xml file to a package.xml file, which includes changing the content a little.

After that, just start compiling it and fix any errors that arise. You probably won't have that many and they are not likely to be difficult to fix for the ROS API errors. Most problems will probably be in using other ROS packages depended on by your package.