How and where I can redefine $KDEHOME variable?
For customize directory where KDE store settings.

You need to do this prior to KDE startup. This can be done in ~/.profile I believe.

the command would be: export $KDEHOME=xxxxxx
and you should test it after restarting KDE with: echo $KDEHOME

Yes it work. Thank You!
But, in this case I must redefine it for each user.

Where redefine it in global?

Tell you why I need it:
I use two linux distro: gentoo and arch.
With the same users home dirs.
But I need that kde store setting per distro.
And I want in one distro define:
KDEHOME=~\.kde.arch
in another
KDEHOME=~\.kde.gentoo

The only way to reconfigure it globally is by passing an argument to the kdelibs configuration process prior to compiling and installing it.

You can do this by setting "_KDE_DEFAULT_HOME_POSTFIX" to ".gentoo" on Gentoo and ".arch" on Arch. This needs to be done on the CMake step of the build procedure.

Eg: cmake -D_KDE_DEFAULT_HOME_POSTFIX=.gentoo

I think (but since I don't use either you should investigate further)

For Gentoo set variables in the /etc/env.d Directory
see 5.b. Defining Variables Globally http://www.gentoo.org/doc/en/handbook/h ... t=2&chap=5

For Arch it would be /etc/profile

Yes it work for me, very big thanks!