can't start xmaxima

Hello.
I can't start xmaxima.
I use Maxima 5.9.0 in Gentoo Linux.

This is what happens.

First I see a message: "Documentation not found in /usr/share/maxima/5.9.0"
And then I get the message:

Error in startup script: can't read "maxima_priv(pReferenceToc)": no such 
element in array
    while executing
"set file $maxima_priv(pReferenceToc)"
    (procedure "vMAXAddSystemMenu" line 120)
    invoked from within
"vMAXAddSystemMenu $fr $maxima_priv(cConsoleText)"
    (procedure "MAXGui:install" line 110)
    invoked from within
"MAXGui:install gui .maxima"
    ("uplevel" body line 1)
    invoked from within
"uplevel [concat $object(__class__):$method gui $args]"
    (procedure "gui" line 3)
    invoked from within
"gui install $fr"
    (procedure "MAXTkmaxima:install" line 22)
    invoked from within
"MAXTkmaxima:install tkmaxima"
    ("uplevel" body line 1)
    invoked from within
"uplevel [concat $object(__class__):$method tkmaxima $args]"
    (procedure "tkmaxima" line 3)
    invoked from within
"tkmaxima install"
    (file "/usr/bin/xmaxima" line 15071)

And then nothing more happens.
Is there a cure for this?

Gunnar