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Instead of using a git dependency (not allowed on crates.io), download the architecture-specific vmlinux.h header at build time from the libbpf/vmlinux.h repository. This approach: - Removes git dependency from Cargo.toml (crates.io compatible) - Downloads correct arch-specific header (x86, aarch64, arm) - Caches downloaded headers in OUT_DIR (reuses between builds) - Works with cargo install - Supports cross-compilation for all architectures The vmlinux.h file (~3-4MB per arch) is downloaded once per architecture and cached, so subsequent builds are fast.
http_req depends on native-tls/openssl-sys which requires OpenSSL to be installed in the cross-compilation containers. Switch to ureq with the rustls backend which has no system dependencies and works in all cross-compilation environments.
The vmlinux.h files in the libbpf/vmlinux.h repository are symlinks to versioned files (e.g. vmlinux_6.14.h). When downloading via raw.githubusercontent.com, we get the symlink content (just the target filename) instead of the actual file. Solution: Download the symlink first to get the target filename, then download the actual versioned file. This ensures we get the full header content instead of just the symlink text.
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