Patch taken from https://bugs.python.org/issue22724 and augmented with
following Nix patch
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/python/cpython/2.7/cross-compile.patch
to fix the whole cross-compilation circus.

---
 Makefile.pre.in | 14 +++++++-------
 configure       |  5 ++++-
 setup.py        |  9 ++++++---
 3 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index 2a14f3323b..6239fc32fc 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -492,7 +492,7 @@ $(BUILDPYTHON):	Modules/python.o $(LIBRARY) $(LDLIBRARY)
 			$(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)
 
 platform: $(BUILDPYTHON) pybuilddir.txt
-	$(RUNSHARED) $(PYTHON_FOR_BUILD) -c 'import sys ; from sysconfig import get_platform ; print get_platform()+"-"+sys.version[0:3]' >platform
+	$(RUNSHARED) $(PY_BUILD_ENVIRON) $(PYTHON_FOR_BUILD) -c 'import sys ; from sysconfig import get_platform ; print get_platform()+"-"+sys.version[0:3]' >platform
 
 # Create</td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>refs</a><a href='/guix/log/gnu/packages/aux-files/chromium'>log</a><a href='/guix/tree/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>tree</a><a class='active' href='/guix/commit/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>commit</a><a href='/guix/diff/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/aux-files/chromium'>
<input type='hidden' name='id' value='fa42774742fb1ddcb9f9424d8150d26f4033d426'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/commit/?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>root</a>/<a href='/guix/commit/gnu?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>gnu</a>/<a href='/guix/commit/gnu/packages?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>packages</a>/<a href='/guix/commit/gnu/packages/aux-files?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>aux-files</a>/<a href='/guix/commit/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>chromium</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='fa42774742fb1ddcb9f9424d8150d26f4033d426'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ludovic Courtès &lt;ludo@gnu.org&gt;</td><td class='right'>2021-01-04 16:51:13 +0100</td></tr>
<tr><th>committer</th><td>Ludovic Courtès &lt;ludo@gnu.org&gt;</td><td class='right'>2021-01-04 23:54:16 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>fa42774742fb1ddcb9f9424d8150d26f4033d426</a> (<a href='/guix/patch/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/guix/tree/?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>90bc98317476ad41de20a8a2158b45334d131355</a> /<a href='/guix/tree/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>gnu/packages/aux-files/chromium</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/packages/aux-files/chromium?id=6c3690fc572bf3231ae60743671b357ffd243017'>6c3690fc572bf3231ae60743671b357ffd243017</a> (<a href='/guix/diff/gnu/packages/aux-files/chromium?id=fa42774742fb1ddcb9f9424d8150d26f4033d426&amp;id2=6c3690fc572bf3231ae60743671b357ffd243017'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/guix/snapshot/guix-fa42774742fb1ddcb9f9424d8150d26f4033d426.tar.gz'>guix-fa42774742fb1ddcb9f9424d8150d26f4033d426.tar.gz</a><br/><a href='/guix/snapshot/guix-fa42774742fb1ddcb9f9424d8150d26f4033d426.zip'>guix-fa42774742fb1ddcb9f9424d8150d26f4033d426.zip</a><br/></td></tr></table>
<div class='commit-subject'>ui: It's 2021 now!</div><div class='commit-msg'>* guix/ui.scm (show-version-and-exit): Change year to 2021.
</div><div class='diffstat-header'><a href='/guix/diff/?id=fa42774742fb1ddcb9f9424d8150d26f4033d426'>Diffstat</a> (limited to 'gnu/packages/aux-files/chromium')</div><table summary='diffstat' class='diffstat'></table><div class='diffstat-summary'>0 files changed, 0 insertions, 0 del