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   AC_CXX_PARTIAL_ORDERING
  
If the compiler supports partial ordering, define HAVE_PARTIAL_ORDERING.
http://autoconf-archive.cryp.to/ac_cxx_partial_ordering.m4
    Copyright © 2008 Todd Veldhuizen
    Copyright © 2008 Luc Maisonobe <luc@spaceroots.org>
   
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