As part of LTP tests, we compile and test some external modules, for example -
https://github.com/linux-test-project/ltp/tree/master/testcases/kernel/syscalls/delete_module

Starting with Tumbleweed kotd version 6.13, building modules fails with - 

Building modules: dummy_del_mod.c dummy_del_mod_dep.c
make -C /lib/modules/6.13.0-rc2-1.gf92fc5d-default/build
M=/root/ltp/testcases/kernel/syscalls/delete_module
make[1]: Entering directory
'/usr/src/linux-6.13.0-rc2-1.gf92fc5d-obj/x86_64/default'
/usr/src/linux-6.13.0-rc2-1.gf92fc5d/Makefile:782:
/usr/src/linux-6.13.0-rc2-1.gf92fc5d/include/config/auto.conf: No such file or
directory
make[1]: *** [../../../linux-6.13.0-rc2-1.gf92fc5d/Makefile:251: __sub-make]
Error 2
make[1]: Leaving directory
'/usr/src/linux-6.13.0-rc2-1.gf92fc5d-obj/x86_64/default'
make: [../../../../include/mk/module.mk:62: .dep_modules] Error 2 (ignored)


openqa step for this -
https://openqa.opensuse.org/tests/4698291#step/install_ltp/116