On Sunday 05 May 2013 10:34:00 you wrote:
> I emerged sage and after starting it I wrote:
> 
> x=var('x');simplify(x+1-x)
> 
> and as a result I got:
> 
> RuntimeError: ECL says: Module error: Don't know how to REQUIRE MAXIMA.
> 
> if anyone else has sage installed, does above work?

Yes, it does.

> if yes, what are the versions of software sage is depending on?

I've got the same as you.

> "equery --no-color g =sci-mathematics/sage-5.8-r3" shows me:
> 
> sci-mathematics/sage-5.8-r3:
>  [  0]  sci-mathematics/sage-5.8-r3
>  [  1]  dev-lisp/ecls-12.12.1
>  [  1]  sci-mathematics/maxima-5.29.1-r1
> [..]

Reinstalling both deps should fix the problem:

emerge -1 =dev-lisp/ecls-12.12.1
emerge -1 =sci-mathematics/maxima-5.29.1-r1

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