$ make -C /srv/nipa-hwksft/testing/wt-X710 mrproper
make: Entering directory '/srv/nipa-hwksft/testing/wt-X710'
scripts/Makefile.clean:12: drivers/net/ethernet/fujitsu/Makefile: No such file or directory
make[6]: *** No rule to make target 'drivers/net/ethernet/fujitsu/Makefile'.  Stop.
make[5]: *** [scripts/Makefile.clean:61: drivers/net/ethernet/fujitsu] Error 2
make[4]: *** [scripts/Makefile.clean:61: drivers/net/ethernet] Error 2
make[3]: *** [scripts/Makefile.clean:61: drivers/net] Error 2
make[2]: *** [scripts/Makefile.clean:61: drivers] Error 2
make[1]: *** [/srv/nipa-hwksft/testing/wt-X710/Makefile:2144: _clean_.] Error 2
make: *** [Makefile:248: __sub-make] Error 2
make: Leaving directory '/srv/nipa-hwksft/testing/wt-X710'