I install for multiple architectures by first unpacking the tar file into a read-only directory, then symlinking the files into a shadow tree, via X11 'lndir'.  Worked fine on Python 1.*.  With 2.0, however, the files Include/graminit.h and Parser/graminit.c are supplied in the tar file, and also generated by the build process.  Of course, they cannot be copied into their respective directories, because the files they are overwriting are in a read-only volume.