secp256k1-abc-sys-0.1.2 doesn't have any documentation.
Binding of libsecp256k1 of Bitcoin ABC implementation
Prerequirement
- CMake v3.5~
Used for compiling libsecp256k1. - clang v3.7~
Used for generating bindings.
More info: https://github.com/rust-lang/rust-bindgen/blob/master/book/src/requirements.md