Inspect the lines that follow this message. It will show the list of the libraries that contain a header file of that name.
The first item in the list, which is prefixed with "Used:", is the library that was chosen for compilation by the Arduino sketch build system.
The subsequent items in the list, which are prefixed with "Not used:", are the other candidate libraries that were not compiled.
As long as the build system chose the intended library, you can safely ignore the message. The presence of multiple candidate libraries won't cause any harm in this case. The build system uses a sophisticated algorithm to decide which library is "best" so it does usually get it right.
If you suspect that a different library than intended was chosen, let us know and we'll provide guidance for influencing the build system to choose the right library.