"mixed implicit and normal rules" on make 3.83

On my gentoo, after update make from 3.82-r2 to 3.83, there is such problem
"mixed implicit and normal rules"

And I found there are such rules in makefile
"config %config: scripts_basic outputmakefile FORCE"

Solution:

1.Emerge back make 3.82, just add package mask to your portage tree
  cat ">=sys-devel/make-3.82" > /etc/portage/package.mask


2.Change makefile
"config %config: scripts_basic outputmakefile FORCE" -->
      "%config: scripts_basic outputmakefile FORCE"