title: fresh installation of PGF/TikZ crashes, why?
body: <p>I have a clean CentOS 5.5 machine with tetex installed. Next, I installed PGF/TikZ:</p>
  
  <pre><code>wget http://media.texample.net/pgf/builds/pgfCVS2010-06-02_TDS.zip
  unzip pgfCVS2010-06-02_TDS.zip
  \cp -r tex /usr/share/texmf
  texhash
  </code></pre>
  
  <p>This is my document:</p>
  
  <pre><code>\documentclass{article}
  \usepackage{tikz}
  \begin{document}
  test
  \end{document}
  </code></pre>
  
  <p>I'm trying to compile it and this is what I'm getting:</p>
  
  <pre><code>$ latex test.tex
  This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4)
  entering extended mode
  (./test.tex
  LaTeX2e &lt;2003/12/01&gt;
  .. skipped ..
  (/usr/share/texmf/tex/latex/pgf/frontendlayer/tikz.sty
  (/usr/share/texmf/tex/latex/pgf/pgf.sty
  (/usr/share/texmf/tex/latex/graphics/graphicx.sty
  (/usr/share/texmf/tex/latex/graphics/graphics.sty
  (/usr/share/texmf/tex/latex/graphics/trig.sty)
  (/usr/share/texmf/tex/latex/graphics/graphics.cfg))))
  (/usr/share/texmf/tex/latex/pgf/utilities/pgffor.sty
  (/usr/share/texmf/tex/latex/pgf/utilities/pgfrcs.sty
  (/usr/share/texmf/tex/generic/pgf/utilities/pgfutil-common.tex)
  (/usr/share/texmf/tex/generic/pgf/utilities/pgfutil-latex.def)
  (/usr/share/texmf/tex/generic/pgf/utilities/pgfrcs.code.tex))
  (/usr/share/texmf/tex/latex/pgf/utilities/pgfkeys.sty
  (/usr/share/texmf/tex/generic/pgf/utilities/pgfkeys.code.tex
  (/usr/share/texmf/tex/generic/pgf/utilities/pgfkeysfiltered.code.tex)))
  (/usr/share/texmf/tex/generic/pgf/utilities/pgffor.code.tex))
  (/usr/share/texmf/tex/generic/pgf/frontendlayer/tikz/tikz.code.tex
  (/usr/share/texmf/tex/generic/pgf/libraries/pgflibraryplothandlers.code.tex
  ! Undefined control sequence.
  \pgfsetplottension ...ttension {\pgf@sys@tonumber 
                                                    \pgf@x }
  l.104 \pgfsetplottension{0.5}
  
  ? 
  </code></pre>
  
  <p>I failed to find any clues in the net about this problem. On other servers I don't such a problem. Could anyone help please? Thanks!</p>
  
  <p>ps. Btw, I tried another build of PGF/TikZ, the older one, no luck :(</p>