lfs-book/chapter05/linux-headers.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
]>

<sect1 id="ch-tools-linux-headers" role="wrap">
  <?dbhtml filename="linux-headers.html"?>

  <title>Linux-Headers-&linux-version;</title>

  <indexterm zone="ch-tools-linux-headers">
    <primary sortas="a-Linux-Headers">Linux-Headers</primary>
    <secondary>tools, headers</secondary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../chapter06/linux-headers.xml"
    xpointer="xpointer(/sect1/sect2[1]/para[1])"/>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&linux-headers-ch5-sbu;</seg>
        <seg>&linux-headers-ch5-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Linux-Headers</title>

    <para>The Linux kernel needs to expose an Application Programming Interface
    (API) for the system's C library (Glibc in LFS) to utilize.  This is done
    by way of sanitizing various C header files that are shipped in the Linux
    kernel source tarball.</para>

    <para>Apply the following patch to provide <command>unifdef</command>, which
    the installation of the kernel headers requires:</para>

<screen><userinput>patch -Np1 -i ../linux-&linux-version;-unifdef-1.patch</userinput></screen>

    <para>Install the header files:</para>

<screen><userinput>mkdir /tools/tmp
make mrproper
make headers_check
make INSTALL_HDR_PATH=/tools/tmp headers_install
cp -R /tools/tmp/include/* /tools/include
rm -r /tools/tmp</userinput></screen>

  </sect2>

  <sect2 role="content">
    <title/>

    <para>Details on this package are located in
    <xref linkend="contents-linux-headers" role="."/></para>

  </sect2>

</sect1>