Christian Heimes <li...@cheimes.de> added the comment:

I just realized that PYTHON_FOR_BUILD is far more complicated. Our WASM build 
system sets the env var to "$(pwd)/cpython/builddir/build/python". The 
configure script expects us to set several additional env vars.

The logic goes like this for cross compiling:

if PYTHON_FOR_BUILD is empty:
    find Python interpreter with same version as PACKAGE_VERSION
    set PYTHON_FOR_BUILD='_PYTHON_PROJECT_BASE=$(abs_builddir) 
_PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(shell test -f 
pybuilddir.txt && echo $(abs_builddir)/`cat pybuilddir.txt`:)$(srcdir)/Lib 
_PYTHON_SYSCONFIGDATA_NAME=_sysconfigdata_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH) 
'$interp
else:
    use user-supplied PYTHON_FOR_BUILD

Since we don't set any of the variables _PYTHON_PROJECT_BASE, 
_PYTHON_HOST_PLATFORM, and _PYTHON_SYSCONFIGDATA_NAME, we get wrong sysconfig 
data file.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45909>
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