use local installed libmongoc first

mongoc-sys/Cargo.toml

@@ -13,3 +13,6 @@ exclude     = ["mongo-c-driver-*"]
 [dependencies]
 libc        = "0.2"
 openssl-sys = "0.9"
+
+[build-dependencies]
+pkg-config = "0.3"

mongoc-sys/build.rs

@@ -1,3 +1,5 @@
+extern crate pkg_config;
+
 use std::env;
 use std::path::Path;
 use std::process::Command;
@@ -5,6 +7,12 @@ use std::process::Command;
 static VERSION: &'static str = "1.8.0"; // Should be the same major version as in the manifest
 
 fn main() {
+    if pkg_config::Config::new()
+        .atleast_version(VERSION)
+        .statik(true)
+        .probe("libmongoc-1.0")
+        .is_err()
+    {
         let out_dir_var = env::var("OUT_DIR").expect("No out dir");
         let out_dir = format!("{}/{}", out_dir_var, VERSION);
         let driver_src_path = format!("mongo-c-driver-{}", VERSION);
@@ -17,22 +25,24 @@ fn main() {
                 VERSION,
                 VERSION
             );
-        assert!(Command::new("curl").arg("-O") // Save to disk
+            assert!(
+                Command::new("curl").arg("-O") // Save to disk
                                     .arg("-L") // Follow redirects
                                     .arg(url)
                                     .status()
                                     .expect("Could not run curl")
-                                    .success());
-
-        let archive_name = format!(
-            "mongo-c-driver-{}.tar.gz",
-            VERSION
+                                    .success()
             );
-        assert!(Command::new("tar").arg("xzf")
+
+            let archive_name = format!("mongo-c-driver-{}.tar.gz", VERSION);
+            assert!(
+                Command::new("tar")
+                    .arg("xzf")
                     .arg(&archive_name)
                     .status()
                     .expect("Could not run tar")
-                                   .success());
+                    .success()
+            );
 
             // Configure and install
             let mut command = Command::new("sh");
@@ -60,22 +70,27 @@ fn main() {
             }
 
             assert!(command.status().expect("Could not run configure").success());
-        assert!(Command::new("make").
-                         current_dir(&driver_src_path).
-                         env("CFLAGS", "-DMONGOC_TRACE").
-                         status().
-                         expect("Could not run make").
-                         success());
-        assert!(Command::new("make").
-                         arg("install").
-                         current_dir(&driver_src_path).
-                         status().
-                         expect("Could not run make install").
-                         success());
+            assert!(
+                Command::new("make")
+                    .current_dir(&driver_src_path)
+                    .env("CFLAGS", "-DMONGOC_TRACE")
+                    .status()
+                    .expect("Could not run make")
+                    .success()
+            );
+            assert!(
+                Command::new("make")
+                    .arg("install")
+                    .current_dir(&driver_src_path)
+                    .status()
+                    .expect("Could not run make install")
+                    .success()
+            );
         }
 
         // Output to Cargo
         println!("cargo:rustc-link-search=native={}/lib", &out_dir);
         println!("cargo:rustc-link-lib=static=bson-1.0");
         println!("cargo:rustc-link-lib=static=mongoc-1.0");
+    }
 }