build: fix sed.1 dependency; work with latest automake

* doc/local.mk (doc/sed.1): Depend not on sed.c, but on the binary
that help2man must run.  Also depend on .version, to be sure we
pick up a version change.  Also, be careful not to write directly
to $@: instead write to $@-t, and make read-only to mark as generated,
and then, only if all is well, rename atomically to $@.
Also, prefix commands with $(AM_V_GEN) and $(AM_V_at) and ensure
that doc/ exists via $(MKDIR_P).
(distclean-local): New target. Use this instead of ...
(dist-hook-man-page): ... this. Remove rule.
(SEDBIN): Remove unnecessary $(top_builddir)/ prefix.
(doc/sed.texi, doc/s-texi): Remove some uses of $(top_builddir).
Replace others with $(srcdir).
* Makefile (dist-hook): remove dependency on dist-hook-man-page.
* lib/local.mk (MOSTLYCLEANFILES): Arrange for lib/.deps/*.Po
to be removed as part of "make distclean", so that make distcheck
no longer fails when using latest automake.

Makefile.am

@@ -50,7 +50,7 @@ BUILT_SOURCES += .version
 
 # Arrange so that .tarball-version appears only in the distribution
 # tarball, and never in a checked-out repository.
-dist-hook: gen-ChangeLog dist-hook-man-page
+dist-hook: gen-ChangeLog
 	$(AM_V_GEN)echo $(VERSION) > $(distdir)/.tarball-version
 
 gen_start_date = 2014-09-06

doc/local.mk

@@ -19,7 +19,7 @@ dist_man_MANS = doc/sed.1
 dist_noinst_DATA = doc/config.texi doc/sed.x doc/sed-in.texi doc/s-texi
 dist_noinst_SCRIPTS = doc/groupify.sed
 HELP2MAN = $(top_srcdir)/build-aux/help2man
-SEDBIN = $(top_builddir)/sed/sed
+SEDBIN = sed/sed
 
 AM_MAKEINFOHTMLFLAGS = --no-split
 
@@ -27,22 +27,28 @@ AM_MAKEINFOHTMLFLAGS = --no-split
 # scripts we group comments with lines following them;
 # since mantaining the "@group...@end group" manually
 # is a burden, we do this automatically
-$(top_srcdir)/doc/sed.texi: $(top_srcdir)/doc/s-texi
-$(top_srcdir)/doc/s-texi: doc/sed-in.texi $(top_srcdir)/doc/groupify.sed
-	sed -nf $(top_srcdir)/doc/groupify.sed \
-	  < $(top_srcdir)/doc/sed-in.texi > $(top_srcdir)/doc/sed-tmp.texi
-	if cmp $(top_srcdir)/doc/sed.texi $(top_srcdir)/doc/sed-tmp.texi; then \
-	  rm -f $(top_srcdir)/doc/sed-tmp.texi; \
+doc/sed.texi: $(srcdir)/doc/s-texi
+doc/s-texi: doc/sed-in.texi $(srcdir)/doc/groupify.sed
+	sed -nf $(srcdir)/doc/groupify.sed \
+	  < $(srcdir)/doc/sed-in.texi > $(srcdir)/doc/sed-tmp.texi
+	if cmp $(srcdir)/doc/sed.texi $(srcdir)/doc/sed-tmp.texi; then \
+	  rm -f $(srcdir)/doc/sed-tmp.texi; \
 	else \
-	  mv -f $(top_srcdir)/doc/sed-tmp.texi $(top_srcdir)/doc/sed.texi; \
+	  mv -f $(srcdir)/doc/sed-tmp.texi $(srcdir)/doc/sed.texi; \
 	fi
-	echo stamp > $(top_srcdir)/doc/s-texi
+	echo stamp > $(srcdir)/doc/s-texi
 
-doc/sed.1: $(top_srcdir)/sed/sed.c $(top_srcdir)/configure.ac \
-           $(top_srcdir)/doc/sed.x
-	$(HELP2MAN) --name "stream editor for filtering and transforming text" \
-	  -p sed --include $(top_srcdir)/doc/sed.x \
-	  -o $(top_srcdir)/doc/sed.1 $(SEDBIN)
+doc/sed.1: sed/sed .version $(srcdir)/doc/sed.x
+	$(AM_V_GEN)$(MKDIR_P) doc
+	$(AM_V_at)rm -rf $@-t
+	$(AM_V_at)$(HELP2MAN)						\
+	    --name 'stream editor for filtering and transforming text'	\
+	    -p sed --include $(srcdir)/doc/sed.x			\
+	    -o $@-t $(SEDBIN)						\
+	  && chmod a-w $@-t						\
+	  && mv $@-t $@
 
-dist-hook-man-page:
-	touch $(distdir)/doc/sed.1
+# Remove the generated sed.1 file, but only for a non-srcdir build.
+# Without this, 'make distcheck's final comparison would fail.
+distclean-local:
+	test x$(srcdir) = x$(builddir) || rm -f $(dist_man_MANS)

lib/local.mk

@@ -22,3 +22,8 @@ lib_libsed_a_CFLAGS = $(AM_CFLAGS) $(GNULIB_WARN_CFLAGS) $(WERROR_CFLAGS)
 
 lib_libsed_a_LIBADD += $(LIBOBJS) $(ALLOCA)
 lib_libsed_a_DEPENDENCIES += $(LIBOBJS) $(ALLOCA)
+
+# This is a kludge to remove lib/.deps/{getfilecon,obstack}.Po,
+# which are left behind by bleeding edge automake.
+# Without this, 'make distcheck's final comparison would fail.
+MOSTLYCLEANFILES += lib/.deps/*.Po