Linux: unable to determine MAXIMA_PREFIX



Hi all,
I am trying to run Maxima under linux. I have installed all necessary 
packages, but when I start it by typing:
 > maxima
I get:

/usr/bin/maxima: unable to determine MAXIMA_PREFIX

What to do?
In /usr/share there is a maxima folder, in this folder is a folder 5.9.2 
and in this are:
demo ,doc, emacs, msgs, share, src, tests, xmaxima folders.
Thanks
Karl