From 43bde28b68346bcfa2b4cf3dffb060d995e00132 Mon Sep 17 00:00:00 2001
From: Olivier Bellone <ob@stripe.com>
Date: Fri, 13 Sep 2019 14:09:55 -0700
Subject: [PATCH] Pass CFLAGS and LDFLAGS when running tests

---
 tox.ini | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tox.ini b/tox.ini
index b9a102a64..6e1d84b67 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,6 +17,12 @@ skip_missing_interpreters = true
 [testenv]
 description = run the unit tests under {basepython}
 commands = python setup.py test -a "{posargs:-n auto}"
+# compilation flags can be useful when prebuilt wheels cannot be used, e.g.
+# PyPy 2 needs to compile the `cryptography` module. On macOS this can be done
+# by passing the following flags:
+# LDFLAGS="-L$(brew --prefix openssl@1.1)/lib"
+# CFLAGS="-I$(brew --prefix openssl@1.1)/include"
+passenv = LDFLAGS CFLAGS
 
 [testenv:fmt]
 description = run code formatting using black