second set of commits for keep-chap5-chap6-seperate

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@1897 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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+<sect2>
+<title>Command explanations</title>
+
+<para><userinput>ln -s /static/bin/pwd /bin/pwd</userinput>: The kernel
+source hard-wires the path to <filename>pwd</filename> to be
+<filename>/bin/pwd</filename> so we create a temporary symlink to deal with
+it.</para>
+
+<para><userinput>make mrproper:</userinput> This will ensure that the kernel
+tree is absolutely clean.  We do this because the kernel team recommend
+that this is done prior to <emphasis>each</emphasis> kernel compilation,
+and that we shouldn't rely on the source tree being automatically clean
+after untarring.</para>
+
+<para><userinput>make include/linux/version.h</userinput> and
+<userinput>make symlinks</userinput>: This creates the
+<filename>include/linux/version.h</filename>, as well as the <filename
+class="symlink">include/asm</filename> symlink.</para>
+
+<para><userinput>mkdir $LFS/usr/include/asm</userinput>
+and <userinput>cp include/asm/* $LFS/usr/include/asm</userinput>:
+This copies the platform-specific assembler kernel header files to
+<filename>$LFS/usr/include/asm</filename></para>
+
+<para><userinput>cp -R include/linux $LFS/usr/include</userinput>:
+This command copies the cross-platform kernel header files to
+<filename>$LFS/usr/include</filename></para>
+
+<para><userinput>touch $LFS/usr/include/linux/autoconf.h</userinput>: Some
+kernel header files include this <filename>autoconf.h</filename> file, but
+outside the Linux source tree, that file has no meaning so we just create
+an empty one so we don't get compile errors whenever it happens to be a
+dependency of another kernel header file.</para>
+
+</sect2>
+