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To test PR 4172 on linux one needs a chroot. The following test is run on archlinux using systemd-nspawn (a chroot on steroids, see https://wiki.archlinux.org/index.php/Systemd-nspawn).
1) Setup systemd-nspawn by installing arch-install-scripts and by using pacstrap to install the archlinux 'base' package group in the /tmp/chroot container, this installs about 600M of archlinux packages in the chroot:
 $ mkdir /tmp/chroot
 $ pacman -S arch-install-scripts
 # pacstrap -i -c -d /tmp/chroot base --ignore linux
2) Build and install Python in the /tmp/python-build DESTDIR directory:
 $ mkdir /tmp/python-build
 $ ./configure --prefix=/ --without-ensurepip && make
 $ make DESTDIR=/tmp/python-build install
3) Copy the Python distribution to the chroot directory (note the trailing slash in the source directory):
 # rsync -av --keep-dirlinks /tmp/python-build/ /tmp/chroot
4) Boot into the chroot container and run python:
 # systemd-nspawn -b -D /tmp/chroot
 ...
 [ OK ] Started Console Getty.
 [ OK ] Reached target Login Prompts.
 [ OK ] Started Login Service.
 [ OK ] Reached target Multi-User System.
 [ OK ] Reached target Graphical Interface.
 [ OK ] Started Rotate log files.
 Arch Linux 4.13.4-1-ARCH (console)
 chroot login: root
 Last login: Mon Oct 30 10:54:11 on console
 [root@chroot ~]# python3.7
 Python 3.7.0a2+ (heads/bpo-31114:ffa5bff252, Oct 30 2017, 11:24:54)
 [GCC 7.2.0] on linux
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import abc, _bisect, sysconfig, sys
 >>> sys.prefix
 '/usr'
 >>> sysconfig.get_config_var('prefix')
 '/.'
 >>> sys.exit(0)
 [root@chroot ~]# poweroff
 ...
 [ OK ] Reached target Shutdown.
 Container chroot has been shut down.