Avoid having a directory as a prerequisite in doc Makefiles.

It does not play well with time-stamping.

* doc/misc/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.  Use it in all the info rules, rather than depending
on infodir.

* doc/lispref/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.
($(infodir)/elisp): Use $mkinfodir instead of infodir.

* doc/lispintro/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.
($(infodir)/eintr): Use $mkinfodir instead of infodir.

* doc/emacs/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.
($(infodir)/emacs): Use $mkinfodir instead of infodir.

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/misc/ChangeLog b/doc/misc/ChangeLog
index 3d834371815..e080d1fe262 100644
--- a/doc/misc/ChangeLog
+++ b/doc/misc/ChangeLog
@@ -1,5 +1,11 @@
 2010-10-09  Glenn Morris  <rgm@gnu.org>
 
+        * Makefile.in ($(infodir)): Delete rule.
+        (mkinfodir): New.  Use it in all the info rules, rather than depending
+        on infodir.
+
+2010-10-09  Glenn Morris  <rgm@gnu.org>
+
         * gnus.texi (Article Washing): Fix previous change.
 
         * Makefile.in (emacsdir): New variable.