Thanks for the patch.
The 4.1.1 upstream version of spatialite was uploaded to experimental
this week, the packaging uses dh-autoreconf for retooling which solves
the same problem as your patch.
Can you confirm that spatialite 4.1.1-2 builds correctly on arm64?
GnuPG: 0xE88D4AF1 (new) / 0x77A975AD (old)
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