Hi!

Ricardo Wurmus <rekado@elephly.net> skribis:

> Are the bindings not usable with Guile 2.2?

No, but I have good news: those in Mailutils master are usable.  Here’s
a recipe:

--8<---------------cut here---------------start------------->8---
(define-public mailutils-next
  ;; This version of Mailutils supports Guile 2.2, unlike version <= 3.4.
  (let ((commit "62666075e3c7276d308dffef42c7c50dc526925b")
        (revision "0"))
    (package
      (inherit mailutils)
      (version (string-append (package-version mailutils)
                              "-" revision "." (string-take commit 7)))
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://git.savannah.gnu.org/git/mailutils.git")
                      (commit commit)
                      (recursive? #t)))           ;for Gnulib & co.
                (sha256
                 (base32
                  "1m4cbjn02hklp6li14ajfzfg29ibbk38n0c3g8vyfx71iy0pxpnb"))
                (file-name (string-append "mailutils-" version "-checkout"))))
      (outputs '("out" "debug"))
      (inputs
       `(("guile" ,guile-2.2)
         ("gsasl" ,gsasl)                         ;for SMTP authentication
         ,@(alist-delete "guile" (package-inputs mailutils))))
      (native-inputs
       `(("autoconf" ,autoconf-wrapper)
         ("automake" ,automake)
         ("libtool" ,libtool)
         ("gettext" ,gnu-gettext)
         ,@(package-native-inputs mailutils)))
      (arguments
       (substitute-keyword-arguments (package-arguments mailutils)
         ((#:modules modules %gnu-build-system-modules)
          `((srfi srfi-1) ,@modules))
         ((#:configure-flags flags ''())
          `(cons* "--disable-radius"

                  ;; Add "/2.2" to the installation directory.
                  (string-append "--with-guile-site-dir="
                                 (assoc-ref %outputs "out")
                                 "/share/guile/site/2.2")
                  ,flags))
         ((#:phases phases)
          `(modify-phases ,phases
             (replace 'bootstrap
               (lambda* (#:key inputs #:allow-other-keys)
                 (for-each patch-shebang
                           '("bootstrap" "gnulib/gnulib-tool"))
                 (substitute* "bootstrap.conf"
                   (("git submodule" all)
                    (string-append "#" all)))
                 (for-each make-file-writable (find-files "gnulib"))
                 (substitute* "configure.ac"
                   (("AM_GNU_RADIUS") ""))
                 (invoke "./bootstrap" "--no-git" "--skip-po"
                         (string-append "--gnulib-srcdir=gnulib"))
                 #t))
             (delete 'prepare-test-suite)))
         ((#:parallel-build? _ #f)                ;due to parser.y
          #f)
         ((#:tests? _ #f)                         ;XXX
          #f))))))
--8<---------------cut here---------------end--------------->8---

Below is a simple example to get started.  The Mailutils API is not this
complicated but it took me a while to figure it out, so you might find
that module helpful.

Happy emailing!  :-)

Ludo’.