* automake.in (handle_clean): Take $makefile as argument, and define %MAKEFILE% while processing clean.am. (generate_makefile): Pass $makefile to handle_clean. * lib/am/clean.am (distclean, maintainer-clean): Erase %MAKEFILE%, not Makefile. * tests/gnumake.test: New file. * tests/Makefile.am (TESTS): Add gnumake.test. Report from Braden N. McDaniel.