There was a question, there is a task to change the source code of the showkey utility in Linux, in the -k mode, it has a shutdown feature after the user has not entered characters from the keyboard for 10 seconds, there is a need to turn off the utilityβs work on the Enter key, for this the source code was downloaded There are libraries that are not standard, then the Internet break found these libraries on the site:
https://fossies.org/dox/kbd-2.0.4/getfd_8h_source.html
Showkey utility source code:
https://kernel.googlesource.com/pub/scm/linux/kernel/ ..
After adding libraries: version.h , getfd.h , nls.h , config.h , kbd.h
A compilation attempt was made, and the following errors were received: 
$ dpkg -S $(which showkey)2. by analogy - aleksandr barakin