master regression: localmodconfig Can't open arch/$(SRCARCH)/Kconfig

Hello,

Running make localmodconfig with GNU Make 4.1 (Debian package version 4.1-9.1) in the current torvalds master results in the following error:

Can't open arch/$(SRCARCH)/Kconfig at ./scripts/kconfig/streamline_config.pl line 174, <$kinfile> line 8. scripts/kconfig/Makefile:44: recipe for target 'localmodconfig' failed
make[1]: *** [localmodconfig] Error 2
Makefile:526: recipe for target 'localmodconfig' failed
make: *** [localmodconfig] Error 2

I bisected the regression to 104daea149c45cc84842ce77a9bd6436d19f3dd8.

If there is any other information I can provide or way I can assist, or if I have reported the issue incorrectly, please let me know.

Thanks,
Kevin