tar zxvf latex-beamer-2.21.tar.gz -C /usr/share/texmf/tex/latex/
tar zxvf xcolor-2.00.tar.gz  -C /usr/share/texmf/tex/latex/
tar zxvf pgf-0.62.tar.gz  -C /usr/share/texmf/tex/latex/
mktexlsr ou texhash