# How do I install a .dtx file?

When I run:

``````tex algorithms.dtx
``````

for example, I get this message.

``````  ! Undefined control sequence.
l.34 \documentclass
{ltxdoc}
?
``````

Help?

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Depending on how the `.dtx` is constructed, it may not work at all with TeX: you have to use (pdf)latex. To unpack the file you may well need an `.ins` file.

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@an_ant: it doesn't need to be deleted, because it might help other users. You could even improve that chance if you change the title to "Installing a dtx file" or similar, so it could be found by users with a similar problem but any arbitrary package. –  Stefan Kottwitz Dec 11 '10 at 18:59
@Stefan Kottwitz: Got it. I'll try to manage it. –  user1996 Dec 11 '10 at 19:24
Thanks! Forgot that you should "Run LaTeX on the .ins file to unpack the .dtx file". –  user1996 Dec 11 '10 at 19:29
Joseph Wright says "run `latex` on the `.ins`"; however, if you have LaTeX, you also have `ltxdoc.cls`, etc., so that unpacking the `.dtx` doesn't help.
Processing the `.dtx` file with `(pdf)latex` gives all you need -- a file of documentation.