I wonder about the version numbers because of some of the alphanumeric
values in them.

Are the version numbers chosen such that ANY version higher can be
checked for by the following code:

if ( strcmp($ver_running_under, $min_version) > 0){
  use feature;
} else {
  use big nasty, ugly own version of functionality
   -or-
  issue warning that results may not be correct
    because functionality is not necessarily available,
    i.e. getting the REAL include directory being used
    before version 4.
}

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