Don't BR setuptools, use Python's bundled distutils

nfs-ganesha.spec

@@ -115,7 +115,7 @@ Requires: openSUSE-release
 
 Name:		nfs-ganesha
 Version:	4.0
-Release:	4%{?dev:%{dev}}%{?dist}
+Release:	5%{?dev:%{dev}}%{?dist}
 Summary:	NFS-Ganesha is a NFS Server running in user space
 License:	LGPLv3+
 Url:		https://github.com/nfs-ganesha/nfs-ganesha/wiki
@@ -276,7 +276,6 @@ BuildRequires:	python-devel
 %else
 Requires:	python3-gobject, python3-pyparsing
 BuildRequires:	python3-devel
-BuildRequires:	python3-setuptools
 %if ( 0%{?suse_version} )
 Requires:	dbus-1-python
 %else
@@ -630,6 +629,14 @@ install -m 644 config_samples/gpfs.ganesha.log.conf %{buildroot}%{_sysconfdir}/g
 install -m 644 config_samples/gpfs.ganesha.exports.conf	%{buildroot}%{_sysconfdir}/ganesha
 %endif
 
+# setuptools >= 60 changes the environment to use its bundled copy of distutils
+# by default, not the Python-bundled one. To run the Python's standard library
+# distutils, the environment variable must be set.
+# Although technically setuptools is not needed for the cmake scripts, if it's
+# pulled by another package, it changes the environment and consequently,
+# the build fails. This was reported in:
+# https://github.com/pypa/setuptools/issues/3143
+export SETUPTOOLS_USE_DISTUTILS=stdlib
 %cmake_install
 
 %if ( 0%{?fedora} >= 30 || 0%{?rhel} >= 8 )
@@ -894,6 +901,9 @@ exit 0
 %endif
 
 %changelog
+* Fri Mar 04 2022 Karolina Surma <ksurma@redhat.com> - 4.0-5
+- Don't BR setuptools, use Python's bundled distutils
+
 * Fri Jan 28 2023 Kaleb S. KEITHLEY <kkeithle at redhat.com> - 4.0-4
 - NFS-Ganesha 4.1, w/ modern linker (mold), this time for real