エラーメッセージ
cargo-lambda でビルドしようとしたときに以下のようなエラーが出た
$ cargo lambda build --release --arm64 --bin lambda Compiling openssl-sys v0.9.97 error: failed to run custom build command for `openssl-sys v0.9.97` Caused by: process didn't exit successfully: `$PWD/target/release/build/openssl-sys-84db175de3593bc2/build-script-main` (exit status: 101) --- stdout cargo:rerun-if-env-changed=AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR unset cargo:rerun-if-env-changed=OPENSSL_LIB_DIR OPENSSL_LIB_DIR unset cargo:rerun-if-env-changed=AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR unset cargo:rerun-if-env-changed=OPENSSL_INCLUDE_DIR OPENSSL_INCLUDE_DIR unset cargo:rerun-if-env-changed=AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_DIR AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_DIR unset cargo:rerun-if-env-changed=OPENSSL_DIR OPENSSL_DIR unset cargo:rerun-if-env-changed=OPENSSL_NO_PKG_CONFIG cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_aarch64-unknown-linux-gnu cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_aarch64_unknown_linux_gnu cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS cargo:rerun-if-env-changed=PKG_CONFIG_aarch64-unknown-linux-gnu cargo:rerun-if-env-changed=PKG_CONFIG_aarch64_unknown_linux_gnu cargo:rerun-if-env-changed=TARGET_PKG_CONFIG cargo:rerun-if-env-changed=PKG_CONFIG cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_aarch64-unknown-linux-gnu cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_aarch64_unknown_linux_gnu cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR run pkg_config fail: pkg-config has not been configured to support cross-compilation. Install a sysroot for the target platform and configure it via PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a cross-compiling wrapper for pkg-config and set it via PKG_CONFIG environment variable. --- stderr thread 'main' panicked at ' Could not find directory of OpenSSL installation, and this `-sys` crate cannot proceed without this knowledge. If OpenSSL is installed and this crate had trouble finding it, you can set the `OPENSSL_DIR` environment variable for the compilation process. Make sure you also have the development packages of openssl installed. For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora. If you're in a situation where you think the directory *should* be found automatically, please open a bug at https://github.com/sfackler/rust-openssl and include information about your system as well as this message. $HOST = aarch64-apple-darwin $TARGET = aarch64-unknown-linux-gnu openssl-sys = 0.9.97 ', $HOME/.cargo/registry/src/index.crates.io-6f17d22bba15001f/openssl-sys-0.9.97/build/find_normal.rs:190:5 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
対応策
エラーメッセージ中の以下の箇所に注目して対応してみる
Install a sysroot for the target platform and configure it via PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a cross-compiling wrapper for pkg-config and set it via PKG_CONFIG environment variable.
pkg-config のクロスコンパイルラッパーをインストールして PKG_CONFIG という環境変数にセットする
brew install pkg-config-wrapper
pkg-config-wrapper のパスを確認する
$ which pkg-config-wrapper /opt/homebrew/bin/pkg-config-wrapper
PKG_CONFIG という環境変数に確認したパスを設定する
export PKG_CONFIG=/opt/homebrew/bin/pkg-config-wrapper
ビルドが通った
$ cargo lambda build --release --arm64 --bin lambda Compiling openssl-sys v0.9.97 Compiling openssl v0.10.61
