Hi,

I have attached the below patch in an attempt to fix this. I notice that printing.el requires lpr.el, and pr-switches function anyways uses lpr-flatten-list from lpr.el. So there should be no harm using lpr-eval-switch instead of ps-eval-switch. I have verified that lpr-eval-switch is the exact same function as the now obsolete ps-eval-switch; just different names.

Copying Stefan for reviewing and commiting this patch as he was the author of the commit http://git.savannah.gnu.org/cgit/emacs.git/commit/?h=emacs-25&id=2cdeb903c57126d3ad5f0cbd72e182584b76ee29 where ps-eval-switch was removed.

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From 4af9c6403b5917aca27490cc331a36dd6e1222c3 Mon Sep 17 00:00:00 2001

From: Kaushal Modi <kaushal.modi@gmail.com>

Date: Wed, 11 May 2016 12:45:42 -0400

Subject: [PATCH] Fix reference to obsolete fn ps-eval-switch

The `lpr-eval-switch' is functionally the same as `ps-eval-switch' which

was obsoleted in 2cdeb903c57126d3ad5f0cbd72e182584b76ee29.  So using

that instead (Bug#19717).

* printing.el (pr-switches): Use lpr-eval-switch instead of ps-eval-switch.

---

 lisp/printing.el | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/printing.el b/lisp/printing.el

index 3bd5a67..a336aeb 100644

--- a/lisp/printing.el

+++ b/lisp/printing.el

@@ -5673,7 +5673,7 @@ pr-switches

   (or (listp switches)

       (error "%S should have a list of strings" mess))

   (lpr-flatten-list ; dynamic evaluation

-   (mapcar 'ps-eval-switch switches)))

+   (mapcar 'lpr-eval-switch switches)))

 

 

 (defun pr-ps-preview (kind n-up filename mess)

-- 

2.6.0.rc0.24.gec371ff