[pstricks] pst-circ problem in Plain TeX

[وفا خلیقی، Vafa Khalighi]

If you create a simple TeX document like:

\input pst-circ

hi

\end

Then TeX gives the following error:

This is TeX, Version 3.141592 (Web2C 7.5.6)
(./test.tex (/usr/share/texmf-texlive/tex/generic/pst-circ/pst-circ.tex
(/usr/share/texmf-texlive/tex/generic/multido/multido.tex
 v1.41, 2004/05/18 <tvz>)
(/usr/share/texmf-texlive/tex/generic/pstricks/pstricks.tex
we are running tex and have to define some LaTeX commands ...
`PSTricks' v1.26  <2008/06/26> (tvz)
(/usr/share/texmf-texlive/tex/generic/pstricks/pstricks.con))
(/usr/share/texmf-texlive/tex/generic/pstricks/pst-node.tex  v1.00, 2007/10/16)
 (/usr/share/texmf-texlive/tex/latex/xkeyval/pst-xkey.tex
2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
(/usr/share/texmf-texlive/tex/latex/xkeyval/xkeyval.tex
2006/11/18 v2.5f key=value parser (HA)
(/usr/share/texmf-texlive/tex/latex/xkeyval/xkvtxhdr.tex
2005/02/22 v1.1 xkeyval TeX header (HA))
(/usr/share/texmf-texlive/tex/latex/xkeyval/keyval.tex)))
`pst-circ' v1.46(CJ,hv,pd)
! Undefined control sequence.
l.2507 \newcommand
                  {\pst at draw@mixer}[3]{%
? 


I have installed the lastes pstricks and xkeyval packages. So does anyone no what can I do to solve this problem?

Thanks

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