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The go.dev install puts Go in /usr/local/go/bin, but the PATH export only lasted for the setup script session. Subsequent shells still found the old distro Go. Now appends PATH to ~/.profile and ~/.bashrc.
The musl-gcc wrapper on Linux (musl-tools) uses musl headers/libraries but doesn't enforce static linking by default. Rust's +crt-static only controls library selection (libc.a vs libc.so) via #[link] attributes — it does NOT pass -static to the linker. Without -static, the binary still gets an ELF INTERP header (/lib/ld-musl-x86_64.so.1), making it "dynamically linked" even though code is from .a files. The guest binary runs inside a minimal VM where the musl dynamic linker doesn't exist, so it needs a truly static binary (no INTERP header). - Add -C link-arg=-static to musl target rustflags in both .cargo/config.toml files - Re-enable check_prerequisites in build-guest.sh for fail-fast on missing musl toolchain
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