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I have texlive-fonts-extra installed:

$ port installed texlive-fonts-extra
The following ports are currently installed:
  texlive-fonts-extra @22691_0+doc (active)

According to https://trac.macports.org/wiki/TeXLivePackages, texlive-fonts-extra has doublestroke

However, while compiling ($ pdflatex article.tex) a .tex file containing

\usepackage{mathtools, doublestroke}

I get

! LaTeX Error: File `doublestroke.sty' not found.

I am using the correct copy of latex since

$ which pdflatex
/opt/local/bin/pdflatex

What should I do to troubleshoot?

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2  
There is no doublestroke.sty package. The name to use is dsfont –  egreg Mar 8 '12 at 22:38
    
Thanks @egreg, that worked! Wanna put it in an answer so I can accept it? –  highBandWidth Mar 8 '12 at 22:44
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1 Answer

I don't think there is a doublestroke package. According to the documentation for doublestroke you need

\usepackage{dsfont}

Alternatively, you can access the font as follows, but the package is the better option.

\documentclass{article}
\font\dsrom=dsrom10 
\begin{document}
\[\hbox{\dsrom N}=\{0,1,2,\ldots\}\]
\[\hbox{\dsrom ABCDEFGHIJKLMNOPQRSTUVWXYZ}\]
\end{document}
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The usage of \font in LaTeX is highly discouraged. Would you consider removing that part? –  egreg Mar 8 '12 at 22:44
    
@egreg --- I posted too quickly, in a failed effort to get there before you! I have corrected my answer. –  Ian Thompson Mar 8 '12 at 22:46
    
I had TeX Live Utility running. :) –  egreg Mar 8 '12 at 22:49
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