[PATCH] MH-E: handle removal of mhparam libdir from nmh 1.8

[Mike Kupfer <kupfer@rawbw.com>]

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nmh 1.8 has not been released yet, but the first release candidate is
out.  I haven't had time to test it yet, but a user has reported that
the mh-version command breaks with it.  That is, mh-version is only able
to report a few things before erroring out on a nil value where a string
was expected.

The attached patch fixes the problem and works on older nmh releases as
well as 1.8.  Is it okay for emacs-29? 

thanks,
mike

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From 77baa31a2f2dba1a5c83fc9d74c44628207616b7 Mon Sep 17 00:00:00 2001
From: Mike Kupfer <kupfer@rawbw.com>
Date: Mon, 16 Jan 2023 13:50:49 -0800
Subject: [PATCH] MH-E: handle removal of mhparam libdir from nmh 1.8

* lisp/mh-e/mh-e.el (mh-variant-nmh-info): If "libdir" doesn't
work, try "libexecdir" (SF#491).
---
 lisp/mh-e/mh-e.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lisp/mh-e/mh-e.el b/lisp/mh-e/mh-e.el
index 1640c23e002..34c809a5ecd 100644
--- a/lisp/mh-e/mh-e.el
+++ b/lisp/mh-e/mh-e.el
@@ -764,6 +764,8 @@ mh-variant-nmh-info
   ;; Sample '-version' outputs:
   ;; mhparam -- nmh-1.1-RC1 [compiled on chaak at Fri Jun 20 11:03:28 PDT 2003]
   ;; install-mh -- nmh-1.7.1 built October 26, 2019 on build-server-000
+  ;; "libdir" was deprecated in nmh-1.7 in favor of "libexecdir", and
+  ;; removed completely in nmh-1.8.
   (let ((install-mh (expand-file-name "install-mh" dir)))
     (when (mh-file-command-p install-mh)
       (erase-buffer)
@@ -774,7 +776,8 @@ mh-variant-nmh-info
               (mh-progs dir))
           `(,version
             (variant        nmh)
-            (mh-lib-progs   ,(mh-profile-component "libdir"))
+            (mh-lib-progs   ,(or (mh-profile-component "libdir")
+                                 (mh-profile-component "libexecdir")))
             (mh-lib         ,(mh-profile-component "etcdir"))
             (mh-progs       ,dir)
             (flists         ,(file-exists-p
-- 
2.30.2