Question

Here is my try:

(if (eq system-type 'gnu/linux)
    (load "/usr/share/emacs/site-lisp/site-gentoo")
    (require 'site-gentoo))

But anyways I receive error on windows :

/.emacs':

File error: Cannot open load file, site-gentoo

Answer 1

Your problem is in the way you use if: its documentation says it’s

(if COND THEN ELSE...)

I.e. your (require 'site-gentoo) gets executed if and only if it’s not a GNU/Linux system.

Use when instead, that should do what you intend.

Also, there should actually no need to use both load and require, their usage should have the same result. The differences are mostly that require will search the load-path and don’t load something again that was already loaded before.