From 21a2f816fcd47ee5119d2841b5c490e6c348129e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Niederb=C3=BChl?= <a.niederbuehl@gmail.com>
Date: Wed, 15 May 2019 23:22:24 +0200
Subject: [PATCH] build.rs: Handle `python` being Python 2

If `python` refers to Python 2 (as recommended in [1]) the build fails
with:
  AttributeError: 'module' object has no attribute 'base_prefix'

Since there is no `base_prefix` in Python 2, simply use `exec_prefix` if
the AttributeError is raised.

[1] https://www.python.org/dev/peps/pep-0394/
---
 build.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/build.rs b/build.rs
index 8efff375..52685d04 100644
--- a/build.rs
+++ b/build.rs
@@ -503,7 +503,10 @@ if PYPY:
 else:
     print(sysconfig.get_config_var('Py_ENABLE_SHARED'))
 print(sysconfig.get_config_var('LDVERSION') or sysconfig.get_config_var('py_version_short'))
-print(sys.base_prefix)
+try:
+    print(sys.base_prefix)
+except AttributeError:
+    print(sys.exec_prefix)
 print(platform.python_implementation())
 "#;
     let out = run_python_script(interpreter, script)?;