blic License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, see <https://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the
  library `Frob' (a library for tweaking knobs) written by James Random Hacker.

  <signature of Moe Ghoul>, 1 April 1990
  Moe Ghoul, President of Vice

That's all there is to it!