[CMake] Version Check

[Renato Golin]

While searching for a version number comparison, I found a few custom
solutions[1][2], but nothing official. Is there a canonical way of saying:

IF (LIBXML2_VERSION GREATER_EQUAL 2.8.0)
  do_something...
END

If not, which is the custom solution I should use?

Thanks!
--renato

[1] http://www.cmake.org/Wiki/CMakeCompareVersionStrings
[2]
http://article.gmane.org/gmane.comp.programming.tools.cmake.user/8533/match=version+comparison
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