交叉编译x86的openwrt程序错误

[qiuzi]

` cargo:rustc-link-lib=static=crypto
cargo:rustc-link-lib=static=ssl
cargo:rerun-if-env-changed=BORING_BSSL_INCLUDE_PATH

--- stderr
deps/boringssl/src/include/openssl/base.h:59:10: fatal error: 'stddef.h' file not found
thread 'main' panicked at 'Unable to generate bindings: ClangDiagnostic("deps/boringssl/src/include/openssl/base.h:59:10: fatal error: 'stddef.h' file not found\n")', /home/sda3/openwrt/staging_dir/hostpkg/cargo/registry/src/github.com-1ecc6299db9ec823/boring-sys-2.1.0/build.rs:457:39

是否缺少某个依赖？之前已安装libclang-dev