From d302c13d2b732f1ff88d3657ceca1852d7e441cb Mon Sep 17 00:00:00 2001
From: Alex McArther <acmcarther@gmail.com>
Date: Tue, 9 Jan 2018 19:24:12 -0800
Subject: Make CARGO_PKG_VERSION option_env!, rather than env!

---
 src/options.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/options.rs b/src/options.rs
index c35aa276..6d6e712c 100644
--- a/src/options.rs
+++ b/src/options.rs
@@ -19,7 +19,7 @@ where
     );
 
     let matches = App::new("bindgen")
-        .version(env!("CARGO_PKG_VERSION"))
+        .version(option_env!("CARGO_PKG_VERSION").unwrap_or("unknown"))
         .about("Generates Rust bindings from C/C++ headers.")
         .usage("bindgen [FLAGS] [OPTIONS] <header> -- <clang-args>...")
         .args(&[
-- 
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