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Well... the usual way in which people implemented sharing between 
architectures was that the /usr/share hierarchy duplicated the other 
hierarchies (i.e. with bin, lib, etc), and it was simply mounted cross-
platform from an nfs server. That's the architecture the Python install 
was created for. I have no idea why FHS modified this test-and-tried 
layout that's been in use for at least 15 years.

But: if you really want the other layout, why not submit a fix to 
configure.in and Makefile.pre.in? Simply add, say, --fhs-prefix=/usr/
share and if that option is present override the Makefile.pre.in 
declarations for SCRIPTDIR, LIBDEST and INCLUDEDIR?

(Hmm, coming to think of it: it seems rather silly that the FHS puts 
include files into /usr/include, where they aren't shared... If there's one 
thing that can be crossplatform it's source code....)