Building and using local libsodium library automatically

.gitignore

@@ -3,3 +3,4 @@ vpncloud-oldnodes
 ._*
 .~*
 deb/vpncloud/vpncloud*
+Stats.ods

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 This project follows [semantic versioning](http://semver.org).
 
+### Unreleased
+
+- [changed] Building and using local libsodium library automatically
+
 ### v0.5.0 (2016-04-05)
 
 - [added] Added license and copyright information

build.rs

@@ -1,7 +1,15 @@
 extern crate gcc;
 extern crate pkg_config;
 
+use std::process::Command;
+use std::path::Path;
+
 fn main() {
-    pkg_config::find_library("libsodium").unwrap();
+    if ! Path::new("libsodium/src/libsodium/.libs/libsodium.a").exists() {
+        Command::new("sh").arg("autogen.sh").current_dir("libsodium").status().unwrap();
+        Command::new("sh").arg("configure").current_dir("libsodium").status().unwrap();
+        Command::new("make").current_dir("libsodium").status().unwrap();
+    }
     gcc::Config::new().file("src/c/tuntap.c").include("src").compile("libtuntap.a");
+    println!("cargo:rustc-link-search={}", "libsodium/src/libsodium/.libs");
 }