Select Python 3.7+ stable ABI "manually" if CMake doesn't support it

CMakeLists.txt

@@ -13,9 +13,6 @@ option(ENABLE_CUTF8 "Enable C.UTF-8 as default locale" ON)
 option(ENABLE_NLS "Enable native language support" ON)
 option(ENABLE_OPENMP "Enable OpenMP threading support" ON)
 option(ENABLE_PYTHON "Enable Python bindings" ON)
-cmake_dependent_option(
-	ENABLE_PYTHON_SABI "Build Python bindings with the Stable ABI" ON
-	"ENABLE_PYTHON; CMAKE_VERSION VERSION_GREATER_EQUAL 3.26" OFF)
 option(ENABLE_PLUGINS "Enable plugin support" ON)
 option(ENABLE_WERROR "Stop build on warnings" OFF)
 option(ENABLE_SQLITE "Enable sqlite rpmdb support" ON)
@@ -237,6 +234,10 @@ if (ENABLE_BDB_RO)
 endif()
 list(APPEND db_backends dummy)
 
+cmake_dependent_option(ENABLE_PYTHON_SABI
+	"Use CMake's mechanism for Python Stable ABI. Needs Python 3.7+."
+	ON "ENABLE_PYTHON; CMAKE_VERSION VERSION_GREATER_EQUAL 3.26" OFF
+)
 if (ENABLE_PYTHON)
 	if (ENABLE_PYTHON_SABI)
 		find_package(Python3 3.7 COMPONENTS Interpreter Development.SABIModule REQUIRED)

python/CMakeLists.txt

@@ -19,9 +19,14 @@ set (sources
 )
 
 if (ENABLE_PYTHON_SABI)
+	# Use CMake's support for Python stable ABI
 	Python3_add_library(_rpm USE_SABI 3.7 ${sources})
 else ()
 	Python3_add_library(_rpm ${sources})
+	if (PYTHON_VERSION VERSION_GREATER_EQUAL 3.7)
+		# Select Python stable ABI "manually" on Python 3.7+
+		target_compile_definitions(_rpm PRIVATE Py_LIMITED_API=0x03070000)
+	endif ()
 endif ()
 
 target_link_libraries(_rpm PRIVATE librpmio librpm librpmbuild librpmsign)