Apparently, message-default-charset is deprecated, which causes the
following warning messages during the build:

  In notmuch-maildir-setup-message-for-saving:
  emacs/notmuch-maildir-fcc.el:172:31:Warning: ‘message-default-charset’ is an
      obsolete variable (as of 26.1); The default charset comes from the
      language environment

In discussion with emacs upstream over on
https://debbugs.gnu.org/35370, it appears that we can just drop this
entirely and things should still work with emacs 25.
---
 emacs/notmuch-maildir-fcc.el | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/emacs/notmuch-maildir-fcc.el b/emacs/notmuch-maildir-fcc.el
index 1551e8b6..ae56bacd 100644
--- a/emacs/notmuch-maildir-fcc.el
+++ b/emacs/notmuch-maildir-fcc.el
@@ -169,8 +169,7 @@ This is taken from the function message-do-fcc."
   (message-encode-message-body)
   (save-restriction
     (message-narrow-to-headers)
-    (let ((mail-parse-charset message-default-charset))
-      (mail-encode-encoded-word-buffer)))
+    (mail-encode-encoded-word-buffer))
   (goto-char (point-min))
   (when (re-search-forward
 	 (concat "^" (regexp-quote mail-header-separator) "$")
-- 
2.20.1

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