Shared files between packages

[slavaaaaaaaaaa]

When compiling certain libraries (in my case, libgpg-error and libassuan, compiled from source), some files are shared (in my case, /usr/share/info/dir, for example, which is a listing of libraries installed, that can be called upon by the command info).

What is the best way to handle such a situation? Is it best to simply ignore these files, or is there a built-in way to merge them?