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Postings from January 2003
Porting/Glossary has :
xs_apiversion (xs_apiversion.U):
This variable contains the version of the oldest perl binary
compatible with the present perl. perl.c:incpush() and
lib/lib.pm will automatically search in $sitearch for older
directories across major versions back to xs_apiversion.
This is only useful if you have a perl library directory tree
structured like the default one.
See INSTALL for how this works.
The versioned site_perl directory was introduced in 5.005,
so that is the lowest possible value.
Since this can depend on compile time options
it is set by Configure. Other non-default sources
of potential incompatibility, such as multiplicity, threads,
^^^^^^^
debugging, 64bits, sfio, etc., are not checked for currently,
^^^^^^ ?
though in principle we could go snooping around in old
Config.pm files.
where the underlined points (at least) seem to be innacurate.
Merijn ?
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