Create tarballs through an Automake-like "make dist" command.

tests/Makefile.in

@@ -1,6 +1,6 @@
 # Makefile for gperf/tests
 
-# Copyright (C) 1989, 1992-1993, 1995, 1998, 2000, 2002-2004, 2007-2009 Free Software Foundation, Inc.
+# Copyright (C) 1989, 1992-1993, 1995, 1998, 2000, 2002-2004, 2007-2009, 2012 Free Software Foundation, Inc.
 # Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
 # and Bruno Haible <bruno@clisp.org>.
 #
@@ -337,5 +337,54 @@ distclean : clean
 
 maintainer-clean : distclean
 
+# List of source files.
+SOURCE_FILES = \
+  configure.ac Makefile.in \
+  test.c \
+  c.gperf c.exp \
+  ada.gperf ada-res.exp adadefs.gperf ada-pred.exp \
+  modula3.gperf modula.exp \
+  pascal.gperf pascal.exp \
+  lang-utf8.gperf lang-utf8.exp \
+  lang-ucs2.gperf lang-ucs2.in lang-ucs2.exp test2.c \
+  smtp.gperf \
+  c-parse.gperf c-parse.exp \
+  objc.gperf objc.exp \
+  chill.gperf chill.exp \
+  cplusplus.gperf cplusplus.exp \
+  java.gperf java.exp \
+  modula2.gperf modula2.exp \
+  test-4.exp \
+  gpc.gperf gpc.exp \
+  permut2.gperf permut2.exp \
+  permut3.gperf permut3.exp \
+  permutc2.gperf permutc2.exp \
+  charsets.gperf charsets.exp \
+  languages.gperf languages.exp \
+  incomplete.gperf incomplete.exp \
+  test-6.exp \
+  test-7.exp \
+  validate \
+  jstest1.gperf \
+  jstest2.gperf \
+  jstest3.gperf \
+  jstest4.gperf \
+  c++.gperf irc.gperf jscript.gperf makeinfo.gperf
+# List of distributed files imported from other packages.
+IMPORTED_FILES =
+# List of distributed files generated by autotools or Makefile.devel.
+GENERATED_FILES = \
+  configure
+# List of distributed files generated by "make".
+DISTRIBUTED_BUILT_FILES =
+# List of distributed files.
+DISTFILES = $(SOURCE_FILES) $(IMPORTED_FILES) $(GENERATED_FILES) $(DISTRIBUTED_BUILT_FILES)
+
+distdir : $(DISTFILES)
+	for file in $(DISTFILES); do \
+	  if test -f $$file; then dir='.'; else dir='$(srcdir)'; fi; \
+	  cp -p $$dir/$$file '$(distdir)'/$$file || exit 1; \
+	done
+
 force :