Merge branch 'stable'

doc/source/pre/whatsnew/1.4.rst

@@ -347,9 +347,10 @@ Changes in Kwant 1.4.2
   backwards-incompatible change only affects Kwant users who use it.
 - Minor bugs were fixed in the KPM module.
 
-Changes after Kwant 1.4.2
--------------------------
+Changes in Kwant 1.4.3
+----------------------
 - Builder properly handles Hermitian conjugation of array-like values.
   Before, if the value was provided not as a true array but, for example, as a
   list of lists, it was not conjugated, which could lead to generation of a
   non-Hermitian Hamiltonian matrix without emitting any error.
+- Various maintenance.

kwant/solvers/sparse.py

@@ -13,7 +13,7 @@ import scipy.sparse as sp
 from . import common
 
 # Note: previous code would have failed if UMFPACK was provided by scikit
-import scipy.sparse.linalg.dsolve.linsolve as linsolve
+from scipy.sparse.linalg.dsolve import linsolve
 
 uses_umfpack = linsolve.useUmfpack
 

setup.py

@@ -19,6 +19,12 @@ import importlib
 import subprocess
 import configparser
 import collections
+
+# Until there is an alternative way to add custom build steps, request that
+# setuptools' local distutils copy is used as global module "distutils".  This
+# works around the future removal of distutils from the stdlib.  See
+# https://github.com/pypa/setuptools/issues/2928#issuecomment-997138589.
+os.environ["SETUPTOOLS_USE_DISTUTILS"] = "local"
 from setuptools import setup, find_packages, Extension, Command
 from distutils.errors import DistutilsError, CCompilerError
 from distutils.command.build import build as build_orig