From 4b47c608284bb57a55aa6d1a0b97743405cbad87 Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Date: Wed, 3 Feb 2021 17:52:35 -0500
Subject: [PATCH] gnu: python-pypa-build: Fix build.

The build was failing following the addition of the sanity-check phase to the
Python buidl system.

* gnu/packages/python-build.scm (python-pypa-build)
[phases]{relax-requirements}: Add phase.
---
 gnu/packages/python-build.scm | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/python-build.scm b/gnu/packages/python-build.scm
index 65b90ddf40..140629ca43 100644
--- a/gnu/packages/python-build.scm
+++ b/gnu/packages/python-build.scm
@@ -127,7 +127,15 @@ (define-public python-pypa-build
                 "1d6m21lijwm04g50nwgsgj7x3vhblzw7jv05ah8psqgzk20bbch8"))))
     (build-system python-build-system)
     (arguments
-     `(#:tests? #f))                    ;to tests in the PyPI release
+     `(#:tests? #f                      ;to tests in the PyPI release
+       #:phases (modify-phases %standard-phases
+                  (add-after 'unpack 'relax-requirements
+                    (lambda _
+                      (substitute* "setup.cfg"
+                        ;; Drop the requirement on python-packaging, which is
+                        ;; not required.
+                        ((".*packaging.*")
+                         "")))))))
     (propagated-inputs
      `(("python-pep517", python-pep517-bootstrap)
        ("python-toml" ,python-toml)))