mptopdf Problem

with teTeX-beta 2.96.4 I get from:

beginfig(1)
draw origin;
endfig;
end

this run:

hahe@hahepc1:~$ mptopdf xx.mp

  TeXExec 4.3 - ConTeXt / PRAGMA ADE 1997-2004

               metapost : xx
                 format : metafun
This is MetaPost, Version 0.641 (Web2C 7.5.3)
(xx.mp [1]
metafun 2004-6-28 23:15
  )
1 output file written: xx.1
Transcript written on xx.log.

         total run time : 1 seconds
pdfetex: unrecognized option `-efmt=mptopdf'
This is pdfeTeX, Version 3.141592-1.20a-rc4-2.1 (Web2C 7.5.3)
kpathsea: Running mktexfmt context.fmt
fmtutil: no info for format `context'.
I can't find the format file `context.fmt'!

MPtoPDF 1.2 : xx is converted to xx-1.pdf

What's wrong?

Regards, Hartmut