From 872d0717bcab8ae3c1482d141c92c15f64bb7140 Mon Sep 17 00:00:00 2001
From: Paul Ganssle <paul@ganssle.io>
Date: Tue, 5 Feb 2019 12:56:39 -0500
Subject: [PATCH] Explicitly declare our build backend

This change more accurately reflects that ``setuptools`` is intended to
use the ``build_meta`` backend from a previous installation. This may
cause some problems with source builds if existing wheels for ``wheel``
and ``setuptools`` are not available. In that event, manually building a
source wheel is recommended.
---
 MANIFEST.in    | 1 -
 pyproject.toml | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/MANIFEST.in b/MANIFEST.in
index 16d60e5ffcf..9cce3c90e47 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -12,4 +12,3 @@ include launcher.c
 include msvc-build-launcher.cmd
 include pytest.ini
 include tox.ini
-exclude pyproject.toml  # Temporary workaround for #1644.
diff --git a/pyproject.toml b/pyproject.toml
index 07c23bb5f5c..164d946171b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,6 @@
 [build-system]
-requires = ["wheel"]
+requires = ["setuptools", "wheel"]
+build-backend="setuptools.build_meta"
 
 [tool.towncrier]
     package = "setuptools"