(EXTRA_DIST): Remove mk-script.pl.

(mk_script): Set to ../mk-script.
(x-tests): Use `$(PERL) -w -- $(mk_script)', not ./mk-script.
Remove @MAINT@ cruft.
(Makefile.am): Likewise.
Remove @MAINT@ cruft.  Now `missing' will explain the failure
when people don't have Perl yet modify a file whose rebuilding
would lead to the use of Perl.

tests/Makefile.am.in

@@ -1,9 +1,9 @@
-## Process this file with automake to produce Makefile.in.
+## Process this file with automake to produce Makefile.in -*-Makefile-*-.
 
 ##test-files-begin
 ##test-files-end
 
-EXTRA_DIST = mk-script.pl Test.pm $x-tests $(explicit) $(maint_gen)
+EXTRA_DIST = Test.pm $x-tests $(explicit) $(maint_gen)
 noinst_SCRIPTS = $x-tests
 
 PERL = @PERL@
@@ -11,28 +11,20 @@ editpl = sed -e 's,@''PERL''@,$(PERL),g' -e 's,@''srcdir''@,@srcdir@,g'
 
 TESTS = $x-tests
 
-$x-tests: @MAINT@mk-script Test.pm
-	./mk-script ../../src/$x > $@.n
+mk_script = $(srcdir)/../mk-script
+$(srcdir)/$x-tests: $(mk_script) Test.pm
+	$(PERL) -w -- $(mk_script) ../../src/$x > $@.n
 	mv $@.n $@
 	chmod 755 $@
 
-SUFFIXES = .pl
-
-.pl:
-	rm -f $@ $@.tmp
-	$(editpl) $< > $@.tmp
-	chmod +x-w $@.tmp
-	mv $@.tmp $@
-
 MAINTAINERCLEANFILES = $x-tests $(maint_gen)
 CLEANFILES = $(run_gen)
 
-@MAINT@rebuild-check: Test.pm mk-script
-@MAINT@	rb=rb-check; rm -f $rb; \
-@MAINT@	m_template=../Makefile.am.in; \
-@MAINT@	sed -n '1,/^##test-files-begin/p' $$m_template > $$rb; \
-@MAINT@	tool=`echo $(subdir)|sed 's/^tests.//;s/-test//'`; \
-@MAINT@	echo "x = $$tool" >> $$rb; \
-@MAINT@	./mk-script --list >> $$rb; \
-@MAINT@	sed -n '/^##test-files-end/,$$p' $$m_template >> $$rb; \
-@MAINT@	diff -u Makefile.am $$rb && echo ok || echo no
+Makefile.am: ../Makefile.am.in Test.pm $(mk_script)
+	rm -f $@ $@t
+	sed -n '1,/^##test-files-begin/p' $< > $@t
+	tool=`echo $(subdir)|sed 's/^tests.//;s/-test//'`; \
+	  echo "x = $$tool" >> $@t
+	$(PERL) -w -- $(mk_script) --list >> $@t
+	sed -n '/^##test-files-end/,$$p' $< >> $@t
+	mv $@t $@