New. Handle PDF layouts through \pdfpagewidth and \pdfpageheight.

etc/refcards/pdflayout.sty

+% Copyright (C) 2007  Free Software Foundation, Inc.
+
+% This file is part of GNU Emacs.
+
+% GNU Emacs is free software; you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation; either version 3, or (at your option)
+% any later version.
+
+% GNU Emacs is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+
+% You should have received a copy of the GNU General Public License
+% along with GNU Emacs; see the file COPYING.  If not, write to
+% the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+% Boston, MA 02110-1301, USA.
+
+% This file defines `\pdflayout':
+%  - \pdflayout=(0) is A4 portrait,
+%  - \pdflayout=(1) is letter (US) portrait,
+%  - \pdflayout=(0l) is A4 landscape.
+%  - \pdflayout=(1l) is letter (US) landscape,
+
+\input ifpdf.sty
+
+\ifpdf
+  \def\pdflayout=(#1#2){
+    \if0#1 % A4
+      \pdfpagewidth=21cm
+      \pdfpageheight=29.7cm
+    \else\if1#1 % Letter
+      \pdfpagewidth=8.5in
+      \pdfpageheight=11in
+    \fi\fi
+    \if l#2 % Landscape
+      \edef\oldwidth{\the\pdfpagewidth}
+      \pdfpagewidth=\pdfpageheight
+      \pdfpageheight=\oldwidth
+    \fi
+  }
+\else
+  \def\pdflayout=(#1#2){}
+\fi
+
+% archtag: 63c938a5-cc78-4964-962d-603c90d34afc