From b1de8a56800fafcf5118143879a55d29929628a9 Mon Sep 17 00:00:00 2001
From: "John W. Parent" <45471568+johnwparent@users.noreply.github.com>
Date: Thu, 14 Apr 2022 14:41:12 -0400
Subject: Windows platform: don't allow MakefilePackage (#29904)

---
 lib/spack/spack/build_systems/makefile.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/spack/spack/build_systems/makefile.py b/lib/spack/spack/build_systems/makefile.py
index eec4d13801..75574a6130 100644
--- a/lib/spack/spack/build_systems/makefile.py
+++ b/lib/spack/spack/build_systems/makefile.py
@@ -10,6 +10,7 @@ from typing import List  # novm
 import llnl.util.tty as tty
 from llnl.util.filesystem import working_dir
 
+from spack.directives import conflicts
 from spack.package import PackageBase, run_after
 
 
@@ -55,6 +56,7 @@ class MakefilePackage(PackageBase):
     #: phase
     install_targets = ['install']
 
+    conflicts('platform=windows')
     #: Callback names for build-time test
     build_time_test_callbacks = ['check']
 
-- 
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