From 15d818928ed8bc953237808f20adc763d915db49 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Sat, 12 Jan 2019 13:54:09 +0000
Subject: Check the USE_SYSTEM_LIBNITROKEY environment variable

This patch introduces the USE_SYSTEM_LIBNITROKEY environment variable.
If it is set when compiling, the nitrokey-sys crate will not try to
build libnitrokey from source but instead uses the system libnitrokey
version.
---
 build.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'build.rs')

diff --git a/build.rs b/build.rs
index af64a69..defce72 100644
--- a/build.rs
+++ b/build.rs
@@ -54,6 +54,11 @@ fn prepare_version_source(
 }
 
 fn main() {
+    if env::var("USE_SYSTEM_LIBNITROKEY").is_ok() {
+        println!("cargo:rustc-link-lib=nitrokey");
+        return;
+    }
+
     let out_dir = env::var("OUT_DIR").expect("Environment variable OUT_DIR is not set");
     let out_path = path::PathBuf::from(out_dir);
 
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