Update README.md

guowenxue

2026-01-23 bde042d41299f0c2bc296f87e5ce6c588c011331

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all: update_cross
    @./build.sh
 
clean:
    @./build.sh -c
 
update_cross:
ifdef CROSS_COMPILE
    sed -i 's|^CROSS_COMPILE=.*|CROSS_COMPILE=${CROSS_COMPILE}|g' build.sh
endif