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.
(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) "$")