From b4309c069f4db09246d43992691cc1ddf9fcce66 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Thu, 5 Sep 2024 12:40:03 +0200
Subject: [PATCH] Clarify need for build-windows-wheel.py.

---
 setup.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/setup.py b/setup.py
index 76312d32..560dafa7 100644
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,16 @@
 from pybind11.setup_helpers import Pybind11Extension
 if os.environ.get("MPLCAIRO_NO_PYCAIRO", ""):
     cairo = None
+elif os.name == "nt":
+    sys.exit("""\
+===============================================================================
+On Windows, please use the tools/build-windows-wheel.py tool to build an
+installable wheel.  Directly installing from a source tree is not supported.
+You may set the MPLCAIRO_NO_PYCAIRO environment variable to clear this message,
+if all necessary dependencies have been manually installed as described in the
+README.
+===============================================================================
+""")
 else:
     import cairo