diff --git a/python-packaging.changes b/python-packaging.changes
index 78ce345..6269cf5 100644
--- a/python-packaging.changes
+++ b/python-packaging.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jul 21 11:16:04 UTC 2022 - Ben Greiner <code@bnavigator.de>
+
+- Refine build and runtime requirements for primary and non-primary
+  builds
+
 -------------------------------------------------------------------
 Fri Jul 15 12:30:44 UTC 2022 - Ben Greiner <code@bnavigator.de>
 
diff --git a/python-packaging.spec b/python-packaging.spec
index 4ae41f7..a0657df 100644
--- a/python-packaging.spec
+++ b/python-packaging.spec
@@ -17,26 +17,24 @@
 
 
 %define modname packaging
-# this must be hardcoded until obs can read it from a prjconf definition
-%if 0%{suse_version} >= 1550
-%define primary_python python310
-%else
-%define primary_python python3
-%endif
+# fallback if primary_python is not available from the project configuration
+%{?!primary_python:%define primary_python python3%{?!sle_version:10}}
 # in order to avoid rewriting for subpackage generator
 %define mypython python
 %global flavor @BUILD_FLAVOR@%{nil}
 %if "%{flavor}" == "primary"
-# this one is built in Ring0
+# this one is goes into Ring0
 %define pprefix %{primary_python}
 %define pythons %{primary_python}
+# Avoid cycle with python-rpm-packaging requiring python3-packaging
+#!BuildIgnore:  %{primary_python}-packaging
 %endif
 %if "%{flavor}" == ""
 # The rest is in Ring1
 %define pprefix python
 %if 0%{suse_version} >= 1550 || 0%{?sle_version} == 150500
 %{expand:%%define skip_%{primary_python} 1}
-BuildRequires:  python3-base >= 3.6
+BuildRequires:  python3-packaging
 %else
 # no non-primary python in <=15.4
 ExclusiveArch:  do-not-build
@@ -51,6 +49,7 @@ ExclusiveArch:  do-not-build
 %bcond_with test
 %endif
 %{?!python_module:%define python_module() python3-%{**}}
+%define skip_python2 1
 Name:           %{pprefix}-packaging%{?psuffix}
 Version:        21.3
 Release:        0
@@ -61,26 +60,26 @@ Source:         https://files.pythonhosted.org/packages/source/p/packaging/packa
 # Fix testsuite on big-endian systems
 # see: https://github.com/pypa/packaging/pull/538
 Patch2:         fix-big-endian-build.patch
-BuildRequires:  %{python_module base}
+BuildRequires:  %{python_module base >= 3.6}
 BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros
 #!BuildIgnore:  post-build-checks-malwarescan
-#!BuildIgnore:  python3-packaging
-# ! Do not add setuptools build dependency here, so that we can get this into Ring0 !
+# ! Do not add setuptools build dependency here, so that the primary package can be in Ring0 !
 # ! Also make sure all runtime dependencies don't require setuptools. !
 BuildArch:      noarch
 %if %{with test}
+BuildRequires:  %{python_module packaging = %{version}}
 BuildRequires:  %{python_module pretend}
-BuildRequires:  %{python_module pyparsing >= 2.0.2}
 BuildRequires:  %{python_module pytest}
 %endif
+%if "%{flavor}" == "primary"
 # See boo#1186870, we can't provide ourselves to pythondistdeps.py
 Provides:       %{mypython}%{python_version}dist(%{modname}) = %{version}-%{release}
-%if "%{python_flavor}" == "python3" || "%{python_provides}" == "python3"
-Provides:       %{mypython}3dist(%{modname}) = %{version}-%{release}
 Provides:       %{mypython}3-%{modname} = %{version}-%{release}
+Provides:       %{mypython}3dist(%{modname}) = %{version}-%{release}
 Obsoletes:      %{mypython}3-%{modname} < %{version}-%{release}
-Requires:       python3-pyparsing >= 2.0.2
+Requires:       %{primary_python}-pyparsing >= 2.0.2
+Requires:       %{mypython}(abi) = %{python_version}
 %else
 Requires:       python-pyparsing >= 2.0.2
 %endif