I think perls do have a built in support for both architecture-dependant and version-dependant directories (and both) in @INC. At least, I can see that support in lib. If I run the (private) sub lib::_get_dirs using 
perl -le "require lib; print for lib::_get_dirs()"

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I see: 
/MSWin32-x64-multi-thread/auto
/MSWin32-x64-multi-thread
/5.24.0
/5.24.0/MSWin32-x64-multi-thread

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These are subdirectories for each directory you add with use lib, that also get added to @INC.

So... version dependent library roots are defenitely possible in a common library directory tree.

In reply to Re^2: Common module lib across Perl versions on same system by bart
in thread Common module lib across Perl versions on same system by VinsWorldcom

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