The following packages will be installed:
 xen 
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  HVM domain support (hvmloader) requires 32bit libs (multilib),
  or you can try symlinking stubs-64.h to stubs-32.h like this:

  # ln -s /usr/include/gnu/stubs-64.h /usr/include/gnu/stubs-32.h

fakeroot -- sh xen.SlackBuild Failed