From 1ebf1a0c6c10e8922ac512d24c902e2c97446770 Mon Sep 17 00:00:00 2001
From: "John W. Parent" <45471568+johnwparent@users.noreply.github.com>
Date: Tue, 19 Dec 2023 03:34:59 -0500
Subject: libxml2: correct improper use of base builder meta (#41760)

---
 var/spack/repos/builtin/packages/libxml2/package.py | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/var/spack/repos/builtin/packages/libxml2/package.py b/var/spack/repos/builtin/packages/libxml2/package.py
index ca92e6994a..ede54ae117 100644
--- a/var/spack/repos/builtin/packages/libxml2/package.py
+++ b/var/spack/repos/builtin/packages/libxml2/package.py
@@ -4,7 +4,6 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 import os
 
-from spack.build_systems import autotools, nmake
 from spack.package import *
 
 
@@ -197,7 +196,7 @@ class Libxml2(AutotoolsPackage, NMakePackage):
             xmllint("--dtdvalid", dtd_path, data_dir.join("info.xml"))
 
 
-class RunAfter:
+class BaseBuilder(metaclass=spack.builder.PhaseCallbacksMeta):
     @run_after("install")
     @on_package_attributes(run_tests=True)
     def import_module_test(self):
@@ -206,7 +205,7 @@ class RunAfter:
                 python("-c", "import libxml2")
 
 
-class AutotoolsBuilder(autotools.AutotoolsBuilder, RunAfter):
+class AutotoolsBuilder(BaseBuilder, spack.build_systems.autotools.AutotoolsBuilder):
     def configure_args(self):
         spec = self.spec
 
@@ -232,7 +231,7 @@ class AutotoolsBuilder(autotools.AutotoolsBuilder, RunAfter):
         return args
 
 
-class NMakeBuilder(nmake.NMakeBuilder, RunAfter):
+class NMakeBuilder(BaseBuilder, spack.build_systems.nmake.NMakeBuilder):
     phases = ("configure", "build", "install")
 
     @property
-- 
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