build.rs

#[cfg(not(feature = "opencv"))]
fn main() {}

#[cfg(feature = "opencv")]
fn main() {
    extern crate bindgen;
    extern crate pkg_config;

    use std::env;
    use std::path;

    let library = pkg_config::Config::new().probe("opencv").unwrap();
    let bindings = bindgen::Builder::default()
        .clang_args(
            library
                .include_paths
                .iter()
                .map(|p| format!("-I{}", p.to_str().unwrap())),
        )
        .header("wrapper.h")
        .whitelist_function("cvCreateImageHeader")
        .whitelist_function("cvSetData")
        .whitelist_function("cvReleaseImageHeader")
        .whitelist_function("cvCopy")
        .whitelist_function("cvShowImage")
        .whitelist_function("cvWaitKey")
        .whitelist_function("cvCreateCameraCapture")
        .whitelist_function("cvReleaseCapture")
        .whitelist_function("cvQueryFrame")
        .prepend_enum_name(false)
        .rustfmt_bindings(false)
        .generate()
        .unwrap();
    bindings
        .write_to_file(path::PathBuf::from(env::var("OUT_DIR").unwrap()).join("bindings.rs"))
        .unwrap();
}