From 2f63f2c5fe1edfa8bd868d01c7096263868092de Mon Sep 17 00:00:00 2001
From: Hynek Schlawack <hs@ox.cx>
Date: Sat, 9 Feb 2019 18:36:30 +0100
Subject: [PATCH] Use isolated builds (#499)

* Use isolated builds

* try to upgrade all the things

* Try to upgrade only setuptools
---
 .travis.yml    | 2 +-
 pyproject.toml | 3 ++-
 tox.ini        | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 09f1f4018..cd4a62f51 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -60,7 +60,7 @@ matrix:
 
 
 install:
-  - pip install tox
+  - pip install --upgrade tox
 
 
 script:
diff --git a/pyproject.toml b/pyproject.toml
index e39808341..5657791df 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,6 @@
 [build-system]
-requires = ["setuptools", "wheel"]
+requires = ["setuptools>=40.6.0", "wheel"]
+build-backend = "setuptools.build_meta"
 
 
 [tool.black]
diff --git a/tox.ini b/tox.ini
index 6af1fe3bd..5d94364e8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
 envlist = typing,lint,py27,py34,py35,py36,py37,pypy,pypy3,manifest,docs,doctest,pypi-description,changelog,coverage-report
+isolated_build = True
 
 
 [testenv]