From bc8a55e70e179a59fa89fb109353182f8f438e00 Mon Sep 17 00:00:00 2001
From: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>
Date: Tue, 7 May 2019 15:08:38 -0400
Subject: [PATCH] Pin the lower bound of PEP517-required setuptools (#171)

* Pin the lower bound of PEP517-required setuptools

It fails with Pip's buggy build env isolation combined with the
default fallback for the build backend which is
``setuptools.build_meta.__legacy__``.

* Point to setuptools PEP 517 backend explicitly
---
 pyproject.toml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pyproject.toml b/pyproject.toml
index 33fb811..f821a2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,10 @@
 [build-system]
 # Must be kept in sync with `setup_requirements` in `setup.py`
 requires = [
-    "setuptools",
+    "setuptools>=40.8.0",
     "wheel",
     "cffi>=1.1; python_implementation != 'PyPy'",
 ]
+# Point to the setuptools' PEP517 build backend explicitly to
+# disable Pip's fallback guessing
+build-backend = "setuptools.build_meta"