Let plain ‘make’ work even not GNU Make
* Makefile.in (top_distclean): Clean makefile as well as Makefile. * configure.ac: If not using plain ‘make’, create a makefile so that plain ‘make’ simply calls $(MAKE).
* Makefile.in (top_distclean): Clean makefile as well as Makefile. * configure.ac: If not using plain ‘make’, create a makefile so that plain ‘make’ simply calls $(MAKE).