> I found this (the first answer)
> http://stackoverflow.com/questions/6874516/relative-line-numbers-in-emacs
> and it pretty much works as expected, but I want one thing to change.
> Instead of showing 0 at the current line I want to show the
> actual line number.

Why not use the package linum-relative
(https://github.com/coldnew/linum-relative) as mentioned in the second
answer? I use linum-relative and it works well for me. In order to get
linum-relative to show the actual line number on the current line, you
need to set linum-relative-current-symbol to "".

(setq linum-relative-current-symbol "")