Bindings not generated in macOS due to missing headers

[msdrigg]

Hi, I'm

I was able to fix this on my machine with this addition to .cargo/config.toml

[env]
BINDGEN_EXTRA_CLANG_ARGS = "-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"
LLVM_CONFIG_PATH = "/opt/homebrew/opt/llvm/bin/llvm-config"

But this isn't going to work with general computers (BINDGEN_EXTRA_CLANG_ARGS needs to be different). For a more general solution, these need to be set

export BINDGEN_EXTRA_CLANG_ARGS="-I$(xcrun --show-sdk-path)/usr/include"
export LLVM_CONFIG_PATH="$(brew --prefix llvm)/bin/llvm-config"

Would there be any way to add this behavior to build.rs or is this more a BUILDING.md problem.