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).

2 files changed, 10 insertions, 2 deletions

diff --git a/Makefile.in b/Makefile.in
index 53703638c42..6b99d24da49 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -869,7 +869,7 @@ top_bootclean=\
 top_distclean=\
         ${top_bootclean}; \
         rm -f config.status config.log~ \
-          Makefile lib/gnulib.mk ${SUBDIR_MAKEFILES}
+          Makefile makefile lib/gnulib.mk ${SUBDIR_MAKEFILES}
 
 distclean_dirs = $(clean_dirs) leim lisp
 
diff --git a/configure.ac b/configure.ac
index 0ecb8c40e61..8b363c7fca6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5814,4 +5814,12 @@ you can continue to support by using '$0 --with-pop'.])
   esac
 fi
 
-test "$MAKE" = make || AC_MSG_NOTICE([Now you can run '$MAKE'.])
+# Let plain 'make' work.
+test "$MAKE" = make || test -f makefile || cat >makefile <<EOF
+.POSIX:
+MAKE = $MAKE
+all:
+        \$(MAKE) -f Makefile \$?
+.DEFAULT:
+        \$(MAKE) -f Makefile \$<
+EOF