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# DLib {#dlib}

     

       
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[DLib](http://dlib.net/) is a modern, C++-based toolkit which provides several machine learning algorithms.

     

       
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## Compiling without AVX support {#compiling-without-avx-support}

     

       
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Especially older CPUs don\'t support [AVX](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions) (Advanced Vector Extensions) instructions that are used by DLib to optimize their algorithms.

     

       
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On the affected hardware errors like `Illegal instruction` will occur. In those cases AVX support needs to be disabled:

     

       
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```nix

     

       
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self: super: { dlib = super.dlib.override { avxSupport = false; }; }

     

       
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```

     

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<section xmlns="http://docbook.org/ns/docbook"

     

       
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         xmlns:xlink="http://www.w3.org/1999/xlink"

     

       
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         xml:id="dlib">

     

       
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 <title>DLib</title>

     

       
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 <para>

     

       
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  <link xlink:href="http://dlib.net/">DLib</link> is a modern, C++-based toolkit which provides several machine learning algorithms.

     

       
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 </para>

     

       
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 <section xml:id="compiling-without-avx-support">

     

       
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  <title>Compiling without AVX support</title>

     

       
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  <para>

     

       
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   Especially older CPUs don't support <link xlink:href="https://en.wikipedia.org/wiki/Advanced_Vector_Extensions">AVX</link> (<abbrev>Advanced Vector Extensions</abbrev>) instructions that are used by DLib to optimize their algorithms.

     

       
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  </para>

     

       
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  <para>

     

       
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   On the affected hardware errors like <literal>Illegal instruction</literal> will occur. In those cases AVX support needs to be disabled:

     

       
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<programlisting>self: super: {

     

       
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  dlib = super.dlib.override { avxSupport = false; };

     

       
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}</programlisting>

     

       
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  </para>

     

       
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 </section>

     

       
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</section>

     

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  This chapter contains information about how to use and maintain the Nix expressions for a number of specific packages, such as the Linux kernel or X.org.

     

       
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 </para>

     

       
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 <xi:include href="citrix.section.xml" />

     

       
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 <xi:include href="dlib.xml" />

     

       
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 <xi:include href="dlib.section.xml" />

     

       
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 <xi:include href="elm.section.xml" />

     

       
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 <xi:include href="emacs.section.xml" />