diff --git a/_multibuild b/_multibuild
index fcc7b97..9e55412 100644
--- a/_multibuild
+++ b/_multibuild
@@ -1,3 +1,4 @@
 <multibuild>
+  <package>primary</package>
   <package>test</package>
 </multibuild>
diff --git a/python-flit-core.changes b/python-flit-core.changes
index 3dfdf89..951839d 100644
--- a/python-flit-core.changes
+++ b/python-flit-core.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jul 14 22:27:53 UTC 2022 - Ben Greiner <code@bnavigator.de>
+
+- Split primary flavor in multibuild for possible inclusion into
+  Ring0
+
 -------------------------------------------------------------------
 Thu Jul 14 15:34:09 UTC 2022 - Ben Greiner <code@bnavigator.de>
 
diff --git a/python-flit-core.spec b/python-flit-core.spec
index 28f0873..b4e76c9 100644
--- a/python-flit-core.spec
+++ b/python-flit-core.spec
@@ -16,17 +16,39 @@
 #
 
 
+# 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
 %global flavor @BUILD_FLAVOR@%{nil}
+%if "%{flavor}" == "primary"
+# this one is built in Ring0
+%define pprefix %{primary_python}
+%define pythons %{primary_python}
+%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
+%else
+# no non-primary python in <=15.4
+ExclusiveArch:  do-not-build
+%define python_module() no-build-without-multibuild-flavor
+%endif
+%endif
 %if "%{flavor}" == "test"
+%define pprefix python
 %define psuffix -test
 %bcond_without test
 %else
-%define psuffix %{nil}
 %bcond_with test
 %endif
-%{?!python_module:%define python_module() python3-%{**}}
-%define skip_python2 1
-Name:           python-flit-core%{psuffix}
+
+Name:           %{pprefix}-flit-core%{?psuffix}
 Version:        3.7.1
 Release:        0
 Summary:        Distribution-building parts of Flit
@@ -51,11 +73,11 @@ The only public interface is the API specified by PEP 517, at flit_core.buildapi
 %prep
 %setup -q -n flit_core-%{version}
 
+%if !%{with test}
 %build
 # https://flit.readthedocs.io/en/latest/bootstrap.html
 python3 -m flit_core.wheel
 
-%if !%{with test}
 %install
 %{python_expand #
 mkdir -p %{buildroot}%{$python_sitelib}
@@ -69,7 +91,7 @@ rm -r  %{buildroot}%{$python_sitelib}/flit_core/tests
 
 %if %{with test}
 %check
-# make sure we do not test the sources but the debundled package
+# make sure we do not test the sources but the package
 rm flit_core/*.py pyproject.toml
 %pytest -rfEs
 %endif