Warning about undefined background when exiting file

Hey all,

Everytime I quit a file viewed or edited by vi/vim I get the following
message:

'Warning: Color name "BACKGROUND" is not defined'

This happens only when in a graphical desktop environment, not on the
'real' console (CTRL+ALT+F2) though. I tried several desktops (MATE [my
default], GNOME Shell, XFCE, KDE) as well as different terminal
emulators (GNOME terminal, MATE terminal, Konsole, LXTerminal,
UXTerm...). Always the same behavior. Then I set different color schemes
for vim, no success. The same happens when changing the color scheme of
the terminal emulator. This behavior afflicts all users, I logged in
with different users, root is affected too.

The locale settings are correct (en_US.UTF-, I checked to be sure that
it's not case of a configuration file that cannot read the variable
'BACKGROUND'. I grep'ed all vim-files for the string 'BACKGROUND' to see
whether there was something misconfigured here, no luck.

It seems like I'm the only person having this problem, I could not find
solution for the issue online.

Vim is in version 7.3.905

The following packages are installed:

vim-core-7.3.905
vim-7.3.905
gvim-7.3.905 (I do not use the GUI, but have it installed nonetheless)

Sabayon Linux 11 64bit (MATE desktop)


Otherwise there are no issues with vi/vim. I can edit files without any
problems, so in principle vi/vim seem work just fine. BTW: It doesn't
matter whether I use VI or VIM, both complain about the background color
being undefined.

Any ideas?

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