Fix removal of extra hidden files from include files

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9113 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/linux-headers.xml

@@ -54,12 +54,14 @@
     <para>Now test and extract the user-visible kernel headers from the source.
     They are placed in an intermediate local directory and copied to the needed
     location because the extraction process removes any existing files in 
-    the target directory.</para>
+    the target directory.  There are also some hidden files used by
+    the kernel developers and not needed by LFS that are removed from
+    the intermediate directory.</para>
 
 <screen><userinput remap="install">make headers_check
 make INSTALL_HDR_PATH=dest headers_install
-cp -rv dest/include/* /usr/include
-find /usr/include -name .install -o -name ..install.cmd -delete</userinput></screen>
+find dest/include \( -name .install -o -name ..install.cmd \) -delete
+cp -rv dest/include/* /usr/include</userinput></screen>
 
   </sect2>