title: Linux kernel compile error elf_x86_64 missing
body: <p>I'm using Ubuntu Linux 12.04 with the 3.11 kernel.</p>
  
  <p>For my work I have to patch the kernel to make it realtime able.</p>
  
  <p>So I downloaded the Linux 2.6.31.6 kernel with the patch and tried to patch, compile and instal it.</p>
  
  <p>While I try to compile it there comes this error:</p>
  
  <pre><code>CC      arch/x86/vdso/vgetcpu.o
  CC      arch/x86/vdso/vvar.o
  VDSO    arch/x86/vdso/vdso.so.dbg
  
  gcc: Error: elf_x86_64: File or directory not found
  make[2]: *** [arch/x86/vdso/vdso.so.dbg] Error 1
  make[1]: *** [arch/x86/vdso] Error 2
  make: *** [arch/x86] Error 2
  </code></pre>
  
  <p>For the compilation of the RT 2.6... kernel I use the same configfile like the 3.11 (with some edited points of course) and I looked into the /arch/x86/vdso directory and the vdso.so.dbg file is missing (and I don't know where to get it).</p>
  
  <p>I hope you can help me and if you need some further informations I will try to provide them.</p>
  
  <p>Yours sincerely
  Adrian</p>