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Ubuntu's libgcc-9-dev-arm64-cross on focal is broken: it misses patch 8c92fcb13a4979232787f0476bf7469ccbb03617 that fixes a mismatched "extern C" block in arm_acle.h. We provide the patched header file in src/compat and include a selector for it. Whenever we detect GCC 9.4, we include the imported header rather than the system provided, broken header. This patch can be reverted when Ubuntu has fixed libgcc-9-dev-arm64-cross.