readme.1st.really

来自「一个可以实现MPLS实验的linux源代码.你不仅可以实现单层标签的转发,还可以」· REALLY 代码 · 共 65 行

If you have errors while compiling any of the utilities used by mpls-linux
(iproute2, iptable, pppd, quagga) it is most likely due to header file
confusion.  Most Linux distributions have two copies of the kernel header
files, one copy in /usr/include/linux|asm and the other copy in the
kernel source (/usr/src/linux/include/linux|asm)  You can choose to "fix"
this or work around it.

"Fix" it
--------

1. Get a modified version of the kernel header files.  The
   glibc-kernheader RPM that I provide for Fedora 2 has the correct
   MPLS additions, and is the prefered way to fix your header files.

2. Hack your distributions files:

   <DISCLAIMER>

   This is how I used to setup my environment for compiling.  It may break
   your machine.  Don't ask me to fix it.  If you don't know what your doing,
   don't do it.  

   Make sure to read:
   linux/Documentation/Changes
   linux/README

   </DISCLAIMER>

   If you're new to compiling non-distrubution kernels (ie you downloaded the
   kernel from ftp.kernel.org or the like), most likly your /usr/include/
   hierachy is all messed up (not your fault, its the fault
   of your distributions ... you're still a good person)

   NOTE: 2.4.13 is just an example kernel version, replace it with whatever
   version this distribution of mpls-linux supports .... otherwise your on
   your own.  Also note that I am a good net-izen and use bzip2 compressed
   files if you do not know the correct tar command line for the tarball you
   grab, go back and read your UNIX man pages, don't ask me.

   cd /usr/src/
   mv linux* /tmp
   tar -Ixf linux-2.4.13.tar.bz2
   mv linux linux-2.4.13
   ln -s linux-2.4.13 linux
   cd /usr/include
   mv linux linux.old
   mv asm asm.old
   ln -s /usr/src/linux/include/linux
   ln -s /usr/src/linux/include/asm

3. Work around it

   You can choose to work around the header file issues by adding the
   path of the kernel source include files to the "CFLAGS" used by the
   compiler.  For some it is as simple as setting a environment
   variable like this:

   setenv CFLAGS "-I /usr/src/linux/include"

   For other aplications you will have to modify the Makefile.  Look
   for the CFLAGS variable and add "-I /usr/src/linux/include" to the
   line.

Good luck!