BLD: fix build error for PyPy on macOS (#26536) (#26862)

Author: robbuckley

doc/source/whatsnew/v0.25.0.rst

@@ -776,6 +776,11 @@ Sparse
 - Introduce a better error message in :meth:`Series.sparse.from_coo` so it returns a ``TypeError`` for inputs that are not coo matrices (:issue:`26554`)
 - Bug in :func:`numpy.modf` on a :class:`SparseArray`. Now a tuple of :class:`SparseArray` is returned (:issue:`26946`).
 
+Build Changes
+^^^^^^^^^^^^^
+
+- Fix install error with PyPy on macOS (:issue:`26536`)
+
 Other
 ^^^^^
 

setup.py

@@ -11,7 +11,7 @@
 
 import pkg_resources
 import platform
-from distutils.sysconfig import get_config_var
+from distutils.sysconfig import get_config_vars
 import sys
 import shutil
 from distutils.version import LooseVersion
@@ -442,19 +442,19 @@ def run(self):
     if debugging_symbols_requested:
         extra_compile_args.append('-g')
 
-# For mac, ensure extensions are built for macos 10.9 when compiling on a
-# 10.9 system or above, overriding distuitls behaviour which is to target
-# the version that python was built for. This may be overridden by setting
+# Build for at least macOS 10.9 when compiling on a 10.9 system or above,
+# overriding CPython distuitls behaviour which is to target the version that
+# python was built for. This may be overridden by setting
 # MACOSX_DEPLOYMENT_TARGET before calling setup.py
 if is_platform_mac():
     if 'MACOSX_DEPLOYMENT_TARGET' not in os.environ:
-        current_system = LooseVersion(platform.mac_ver()[0])
-        python_target = LooseVersion(
-            get_config_var('MACOSX_DEPLOYMENT_TARGET'))
-        if python_target < '10.9' and current_system >= '10.9':
+        current_system = platform.mac_ver()[0]
+        python_target = get_config_vars().get('MACOSX_DEPLOYMENT_TARGET',
+                                              current_system)
+        if (LooseVersion(python_target) < '10.9' and
+                LooseVersion(current_system) >= '10.9'):
             os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.9'
 
-
 # enable coverage by building cython files by setting the environment variable
 # "PANDAS_CYTHON_COVERAGE" (with a Truthy value) or by running build_ext
 # with `--with-cython-coverage`enabled