| 1 | <sect1 id="ch06-kernel-headers">
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| 2 | <title>Installing Linux-&kernel-version; headers</title>
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| 3 | <?dbhtml filename="kernel.html" dir="chapter06"?>
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| 4 |
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| 5 | <screen>Estimated build time: &kernel-time-headers;
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| 6 | Estimated required disk space: &kernel-compsize-headers;</screen>
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| 7 |
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| 8 | <sect2><title> </title><para> </para></sect2>
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| 9 |
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| 10 | <sect2>
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| 11 | <title>Installation of the kernel headers</title>
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| 12 |
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| 13 | <para>We won't be compiling a new kernel yet -- we'll do that when we have
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| 14 | finished the installation of all the packages. But as some packages need the
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| 15 | kernel header files, we're going to unpack the kernel archive now, set it up
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| 16 | and copy the header files so they can be found by these packages.</para>
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| 17 |
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| 18 | <para>It is important to note that the files in the kernel source directory
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| 19 | are not owned by <emphasis>root</emphasis>. Whenever you unpack a package as
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| 20 | user <emphasis>root</emphasis> (like we do here inside chroot), the files end
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| 21 | up having the user and group IDs of whatever they were on the packager's
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| 22 | computer. This is usually not a
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| 23 | problem for any other package you install because you remove the source
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| 24 | tree after the installation. But the Linux kernel source tree is often kept
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| 25 | around for a long time, so there's a chance that whatever user ID the packager
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| 26 | used will be assigned to somebody on your machine and then that person would
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| 27 | have write access to the kernel source.</para>
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| 28 |
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| 29 | <para>In light of this, you might want to run <userinput>chown -R 0:0</userinput>
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| 30 | on the <filename>linux-&kernel-version;</filename> directory
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| 31 | to ensure all files are owned by user <emphasis>root</emphasis>.</para>
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| 32 |
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| 33 | <para>Prepare for header installation:</para>
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| 34 |
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| 35 | <screen><userinput>make mrproper</userinput></screen>
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| 36 |
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| 37 | <para>This ensures that the kernel tree is absolutely clean. The kernel team
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| 38 | recommends that this command be issued prior to <emphasis>each</emphasis> kernel
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| 39 | compilation. You shouldn't rely on the source tree being clean after
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| 40 | untarring.</para>
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| 41 |
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| 42 | <para>Create the <filename>include/linux/version.h</filename> file:</para>
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| 43 |
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| 44 | <screen><userinput>make include/linux/version.h</userinput></screen>
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| 45 |
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| 46 | <para>Create the platform-specific <filename>include/asm</filename>
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| 47 | symlink:</para>
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| 48 |
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| 49 | <screen><userinput>make symlinks</userinput></screen>
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| 50 |
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| 51 | <para>Install the platform specific-header files:</para>
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| 52 |
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| 53 | <screen><userinput>cp -HR include/asm /usr/include
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| 54 | cp -R include/asm-generic /usr/include</userinput></screen>
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| 55 |
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| 56 | <para>Install the cross-platform kernel header files:</para>
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| 57 |
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| 58 | <screen><userinput>cp -R include/linux /usr/include</userinput></screen>
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| 59 |
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| 60 | <para>There are a few kernel header files which make use of the
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| 61 | <filename>autoconf.h</filename> header file. Since we do not yet configure the
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| 62 | kernel, we need to create this file ourselves in order to avoid compilation
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| 63 | failures. Create an empty <filename>autoconf.h</filename> file:</para>
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| 64 |
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| 65 | <screen><userinput>touch /usr/include/linux/autoconf.h</userinput></screen>
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| 66 |
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| 67 | </sect2>
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| 68 | &c6-kernel-exp-headers;
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| 69 | </sect1>
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| 70 |
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