grep honors DESTDIR in some subdirs, but not all

[Nick Moffitt]

the intl/ subdir of the grep source tree contains a Makefile.in that
does the following:

install-exec: all
        if test "$(PACKAGE)" = "gettext" \
           && test '@INTLOBJS@' = '$(GETTOBJS)'; then \
          if test -r $(MKINSTALLDIRS); then \
            $(MKINSTALLDIRS) $(libdir) $(includedir); \
          else \
            $(top_srcdir)/mkinstalldirs $(libdir) $(includedir); \
          fi; \
          $(INSTALL_DATA) intlh.inst $(includedir)/libintl.h; \
          $(INSTALL_DATA) libintl.a $(libdir)/libintl.a; \
        else \
          : ; \
        fi

All of the rest of the system honors DESTDIR, because it used
automake.  Thus, when I do a "make DESTDIR=/tmp/gar install", the
installation errors out.  Some of the subdirs would behave properly
(src comes to mind), but this dir tries to put things in the wrong
place.  Please either switch to automake for this dir or prefix your
$(libdir)s and $(includedirs) with $(DESTDIR).

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