Please check the build logs for more information.
See Builds for ideas on how to fix a failed build, or Metadata for how to configure docs.rs builds.
If you believe this is docs.rs' fault, open an issue.
Maintenance Status
This project is not really accepting new features without a very strong use
case. The primary consumer of this repo has been
coreaudio-rs however
coreaudio-rs has moved to use objc2 generated
bindings. In the nearly 6
years that @simlay has been maintaining this repo, the majority of these PRs
have been bindgen updates and build issues with Xcode/macOS updating clang.
@simlay will accept PRs for fixes of the build should an Xcode/macOS update break things.
coreaudio-sys 
Raw bindings to Apple's Core Audio API for macos and iOS generated using rust-bindgen. coreaudio-rs is an attempt at offering a higher level API around this crate.
Cross Compiling
Rust Cross has a good explanation of how cross-compiling Rust works in general. While the author of Rust Cross advises against it, it is perfectly possible to cross-compile Rust for MacOS on Linux. OSXCross can be used to create a compiler toolchain that can compile for MacOS on Linux.
Environment Variables
When cross-compiling for MacOS on Linux there are two environment variables that are used to configure how coreaudio-sys finds the required headers and libraries. The following examples assume that you have OSXCross installed at /build/osxcross.
COREAUDIO_SDK_PATH
This tell coreaudio-sys where to find the MacOS SDK: