Where is my system-wide init file?

On my Linux distro there are these system-wide initialization files:

/etc/vim/gvimrc
/etc/vim/vimrc
/etc/vim/vimrc.tiny
/usr/share/vim/gvimrc
/usr/share/vim/vimrc
/usr/share/vim/vimrc.tiny

Does GVim load any of them?

:echo $MYVIMRC

returns ~/.vimrc, while

:version

returns

system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/home/egarrulo/bin/vim/vim-7.4.280/share/vim"

and

:echo $VIM

returns:

/home/egarrulo/bin/vim/vim-7.4.280/share/vim

and no .vimrc is there. Thus, GVim shouldn't be loading any of the
above system-wide init files, but it seems it does.

Any idea? Thanks.

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