sqlite3ext-sys 0.0.1

FFI bindings to sqlite3ext.h - you probably want libsqlite3-sys, however
Documentation
extern crate bindgen;

use cc;
use std::env;
use std::path::PathBuf;

fn main() {
    println!("cargo:rerun-if-changed=sqlite3/sqlite3.c");
    cc::Build::new()
        .file("sqlite3/sqlite3.c")
        //.include("sqlite3/sqlite3ext.h")
        .include("sqlite3/sqlite3.h")
        .flag("-DSQLITE_CORE")
        .compile("sqlite3");

    println!("cargo:rerun-if-changed=wrapper.h");

    let bindings = bindgen::Builder::default()
        .header("sqlite3/sqlite3ext.h")
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .generate()
        .expect("Unable to generate bindings");

    let out_path = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR should be defined"));
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");
}