From 5d19b9124a248c23811da03da9896a07e6de12df Mon Sep 17 00:00:00 2001
From: namuyan <thhjuu@yahoo.co.jp>
Date: Sat, 12 Oct 2019 11:23:27 +0900
Subject: [PATCH] check python interpreter by --version

---
 build.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/build.rs b/build.rs
index 7ee4b987..48526d40 100644
--- a/build.rs
+++ b/build.rs
@@ -25,10 +25,13 @@ const MIN_VERSION: &'static str = "1.37.0-nightly";
 
 lazy_static! {
     static ref PYTHON_INTERPRETER: &'static str = {
-        ["python3", "python"]
+        ["python", "python3"]
             .iter()
-            .map(|bin| (bin, Command::new(bin).spawn()))
-            .find(|(_, r)| r.is_ok())
+            .map(|bin| (bin, Command::new(bin).arg("--version").output()))
+            .filter(|(_, r)| r.is_ok())
+            .map(|(bin, r)| (bin, r.unwrap().stderr))
+            // begin with `Python 3.X.X :: additional info`
+            .find(|(_, r)| r.starts_with(b"Python 3"))
             .map(|(bin, _)| bin)
             .expect("Python 3.x interpreter not found")
     };