libnumbertext cannot be cross built from source, because it depends on
the Python interpreter for the host architecture. That interpreter fails
installing as it would have perform byte compilation. libnumbertext
actually wants to run it during build in a way that does not exercise
architecture-dependent properties, so it should be requesting the Python
interpreter for the build architecture instead. I'm attaching a patch
for your convenience. Once applying it, cross building works.

Helmut

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